For React Developers

Best Email Tools for React Developers in 2026 - JSX Templates, TypeScript SDKs & Modern DX

The definitive guide to email tools with React/JSX support, TypeScript SDKs, and developer-first APIs. Build email templates as React components using the same patterns you use for your application UI.

React Email Development at a Glance

Best Overall: Sequenzy - Native JSX, TypeScript SDK, Stripe integration
Best Template Library: React Email - Industry standard for JSX email components
Best DX: Resend - Created React Email, exceptional docs
Best Deliverability: Postmark - Battle-tested, reliable delivery
Best for Tailwind: Maizzle - Native Tailwind CSS support
Best Open Source: Mailing.run - Full-stack email development
Most Affordable: Email Octopus - Budget-friendly with clean API
Best Enterprise: SendGrid - Proven scale, Twilio-backed

What React Developers Want from Email Tools

Traditional email tools were built for marketers using drag-and-drop editors. React developers need tools that integrate with their existing workflow and respect their preferences for code-first solutions.

JSX Email Templates

Build emails as React components using the same JSX syntax and component patterns you use for your application UI. No more context switching between React and archaic HTML table layouts. Import, compose, and render emails just like any other component.

TypeScript SDKs

Native TypeScript support with accurate type definitions that provide real IntelliSense, compile-time error checking, and confidence that the types match runtime behavior. Catch email integration bugs before they reach production.

Modern Developer Experience

Clean APIs with predictable patterns, excellent documentation with working code examples, helpful error messages, and local development tools like preview servers. The same quality of DX you expect from modern JavaScript tooling.

Component Reusability

Share design system elements, color tokens, and component patterns between your application and emails. Build once, use everywhere. Maintain visual consistency across your entire product surface without duplicating styles.

React Developer Experience Comparison

Tool JSX Support TypeScript Type Starting Price
#1 Sequenzy Full Native Full Platform $19/mo
#2 Resend React Email Native Full Platform $20/mo
#3 React Email Native Native Email API Free
#4 Postmark Via React Email Native Email API $15/mo
#5 SendGrid Via React Email Good Email Service $20/mo
#6 Mailgun Via React Email Good Email Service $35/mo
#7 Loops Via API Good Email Service $49/mo
#8 MJML Via mjml-react Community Framework/Library Free
#9 Maizzle Template-based Configuration Framework/Library Free
#10 Mailing.run Native Native Framework/Library Free
#11 Email Octopus Via API Community Framework/Library $9/mo

Complete Email Tool Reviews for React Developers

In-depth analysis of each tool covering React/JSX support, TypeScript integration, developer experience, code examples, and how they fit into modern React workflows.

#1

Sequenzy

Best for SaaS

Email Automation Built for React and TypeScript

$19/mo

10,000 emails included

Sequenzy has emerged as the go-to email platform for React developers building SaaS applications, offering a development experience that feels native to modern TypeScript projects. The platform was designed from the ground up with React developers in mind, providing first-class support for JSX-based email templates that integrate seamlessly with your existing component architecture. When you build emails in Sequenzy, you are using the same React patterns you use for your application UI.

The TypeScript SDK is genuinely comprehensive, not an afterthought wrapped around a JavaScript library. Every API response is fully typed, giving you real IntelliSense and autocomplete that actually matches the runtime behavior. You will catch type errors at compile time rather than discovering them in production when emails fail silently. The types are generated directly from the API specification, so they stay perfectly in sync with new features and changes.

What sets Sequenzy apart for React developers building SaaS products is the native integration with billing providers. Instead of writing webhook handlers to catch Stripe subscription events, parsing customer data, and triggering emails, Sequenzy connects directly to Stripe, Polar, Creem, and Dodo. When a customer upgrades, cancels, or enters a trial, the appropriate email sequences trigger automatically. This eliminates hundreds of lines of boilerplate code and hours of debugging edge cases.

The component-based template system supports importing your own React components, meaning you can share design system elements between your application and your emails. A Button component from your UI library can render in email with appropriate fallbacks for email client compatibility. This consistency dramatically reduces the maintenance burden and ensures your brand is cohesive across every customer touchpoint.

Code Example

import { Sequenzy } from '@sequenzy/sdk';
import { WelcomeEmail } from './emails/welcome';

const sequenzy = new Sequenzy({
  apiKey: process.env.SEQUENZY_API_KEY
});

// Send with JSX template
await sequenzy.emails.send({
  from: 'hello@yourapp.com',
  to: 'user@example.com',
  subject: 'Welcome to Our App!',
  react: <WelcomeEmail
    userName="John"
    planName="Pro"
    trialDays={14}
  />
});

// Or trigger automated sequence
await sequenzy.sequences.trigger({
  sequenceId: 'onboarding',
  email: 'user@example.com',
  properties: {
    plan: 'pro',
    name: 'John',
    signupSource: 'website'
  }
});
JSX Support

Full

TypeScript

Native

Pricing

$19/mo

#2

Resend

Best DX

The Modern Email API Built by Developers

$20/mo

50,000 emails included

Resend has quickly become the standard for developers who prioritize clean APIs and modern tooling. Founded by Zeno Rocha, the creator of Dracula Theme and a well-known figure in the open-source community, Resend was built from deep frustration with existing email APIs. The result is an API that feels like it was designed by someone who actually builds software, because it was.

The React Email library is Resend's signature contribution to the email development ecosystem. Instead of writing HTML tables with inline CSS and fighting email client quirks, you build emails as React components using familiar JSX syntax. The library provides a set of primitives like Container, Row, Column, Button, and Image that handle the complexity of cross-client compatibility. You write clean, declarative code and React Email handles the transformation into the arcane HTML that email clients require.

TypeScript support goes beyond just having type definitions. The entire SDK is written in TypeScript, and the types accurately reflect every possible API response, including error states and edge cases. The compile-time checking catches mistakes that would otherwise only surface in production. When you hover over a method in your IDE, you see detailed documentation and parameter descriptions pulled from the actual API documentation.

The documentation deserves special mention because it represents a new standard for developer documentation. Every endpoint includes working code examples in multiple languages, interactive API explorers where you can test requests directly, and comprehensive guides for common scenarios. Error messages are actionable, telling you exactly what went wrong and how to fix it. The getting-started experience is particularly smooth, with most developers sending their first email in under five minutes.

Code Example

import { Resend } from 'resend';
import { WelcomeEmail } from './emails/welcome';

const resend = new Resend(process.env.RESEND_API_KEY);

// Send with React Email component
const { data, error } = await resend.emails.send({
  from: 'Acme <hello@acme.com>',
  to: ['user@example.com'],
  subject: 'Welcome to Acme!',
  react: WelcomeEmail({ firstName: 'John' })
});

// Full TypeScript support
interface EmailResponse {
  id: string;
}

if (error) {
  console.error('Failed to send:', error.message);
  return;
}

console.log('Email sent:', data.id);
JSX Support

React Email

TypeScript

Native

Pricing

$20/mo

#3

React Email

Open Source

Build Emails with React Components

Free

Open-source library

React Email is a standalone open-source library that transforms how developers create email templates. Rather than wrestling with HTML tables, inline CSS, and the countless quirks of different email clients, you write emails using the same component-based approach you use for building web applications. The library handles the complexity of generating email-compatible HTML from your clean JSX code.

The component library provides semantic building blocks that abstract away email-specific complexity. Components like Html, Head, Body, Container, Section, Row, Column, Heading, Text, Button, Link, Image, and Hr behave predictably and render correctly across Gmail, Outlook, Apple Mail, and dozens of other email clients. Each component accepts familiar props and can be styled using inline styles or the included Tailwind CSS support.

The development experience includes a local preview server that hot-reloads as you edit templates, showing you exactly how emails will render without sending test emails. The preview includes a device switcher so you can check mobile and desktop layouts side by side. You can also render to plain text automatically for accessibility and spam filter compliance.

React Email integrates with any email sending service that accepts HTML input, making it provider-agnostic. While it pairs naturally with Resend, you can use it with SendGrid, Postmark, Amazon SES, Mailgun, or any other provider. The render function converts your React components to HTML strings that you pass to your email API of choice. This flexibility means you are not locked into any particular email infrastructure.

Code Example

import {
  Html,
  Head,
  Body,
  Container,
  Section,
  Heading,
  Text,
  Button,
  Hr,
  Img
} from '@react-email/components';

export function WelcomeEmail({ userName, ctaUrl }) {
  return (
    <Html>
      <Head />
      <Body style={bodyStyle}>
        <Container style={containerStyle}>
          <Img
            src="https://acme.com/logo.png"
            width={120}
            alt="Acme"
          />
          <Heading style={headingStyle}>
            Welcome, {userName}!
          </Heading>
          <Text style={textStyle}>
            We are excited to have you on board.
            Get started by exploring your dashboard.
          </Text>
          <Section style={buttonSection}>
            <Button style={buttonStyle} href={ctaUrl}>
              Go to Dashboard
            </Button>
          </Section>
          <Hr style={hrStyle} />
          <Text style={footerStyle}>
            Acme Inc, 123 Street, City
          </Text>
        </Container>
      </Body>
    </Html>
  );
}
JSX Support

Native

TypeScript

Native

Pricing

Free

#4

Postmark

Best Deliverability

Reliable Transactional Email with Excellent TypeScript Support

$15/mo

10,000 emails included

Postmark has been delivering transactional emails since 2010, and that decade-plus of experience shows in the reliability and predictability of their platform. While Postmark does not have native JSX template support, their excellent TypeScript SDK and clear API design make them a solid choice for React developers who use React Email or similar libraries for template generation.

The Node.js SDK is fully typed and follows modern TypeScript best practices. Method signatures are precise, response types are accurate, and the error types help you handle failures gracefully. The SDK exposes the full API surface, including email sending, template management, bounce processing, and statistics retrieval. You can integrate Postmark into a TypeScript project with confidence that the types will guide you correctly.

Postmark's template system uses a straightforward Mustache-style syntax that some developers prefer for its simplicity. Variables are inserted with double braces, and you can use conditionals and loops for dynamic content. For React developers who prefer JSX, the recommended pattern is to render React Email components to HTML and send that through the Postmark API. This gives you the best of both worlds: component-based template development with Postmark's exceptional deliverability.

The API design prioritizes reliability and transparency. Every email gets a unique message ID that you can use to track delivery status. Webhooks fire reliably for deliveries, bounces, opens, clicks, and spam complaints. The message stream architecture lets you separate transactional and broadcast emails for better deliverability management. For applications where email delivery is business-critical, Postmark's focus on deliverability over features is exactly right.

Code Example

import { ServerClient } from 'postmark';
import { render } from '@react-email/render';
import { WelcomeEmail } from './emails/welcome';

const client = new ServerClient(
  process.env.POSTMARK_API_KEY
);

// Render React Email to HTML
const html = render(
  <WelcomeEmail userName="John" />
);

// Send via Postmark
const response = await client.sendEmail({
  From: 'hello@yourapp.com',
  To: 'user@example.com',
  Subject: 'Welcome to Our App',
  HtmlBody: html,
  TextBody: 'Welcome to our app!',
  MessageStream: 'outbound'
});

console.log('MessageID:', response.MessageID);
JSX Support

Via React Email

TypeScript

Native

Pricing

$15/mo

#5

SendGrid

Enterprise Ready

Enterprise-Scale Email with Comprehensive SDKs

$20/mo

50,000 emails included

SendGrid, now part of Twilio, is one of the most established email platforms with proven reliability at massive scale. For React developers in enterprise environments, SendGrid offers the combination of comprehensive TypeScript support, extensive SDK coverage, and the backing of a major infrastructure company. The platform handles billions of emails daily for companies that cannot afford delivery failures.

The Node.js SDK includes TypeScript definitions that cover the full API surface. While not as refined as newer platforms like Resend, the types are accurate and comprehensive enough for confident development. The SDK design follows familiar patterns, making integration straightforward for experienced Node.js developers. Recent updates have improved the developer experience significantly, with better error messages and more intuitive method signatures.

For React developers, the integration pattern involves rendering your React Email components to HTML and sending through the SendGrid API. This approach gives you full control over template design while leveraging SendGrid's delivery infrastructure. The SDK supports both simple and complex sending scenarios, including dynamic templates, multiple recipients with personalization, and scheduled delivery.

The platform's strength lies in its completeness. Beyond basic email sending, SendGrid provides email validation APIs, dedicated IP management, subuser accounts for multi-tenant applications, and comprehensive analytics. For teams building large-scale applications that need enterprise features and Twilio ecosystem integration, SendGrid remains a compelling choice despite newer competitors with more modern DX.

Code Example

import sgMail from '@sendgrid/mail';
import { render } from '@react-email/render';
import { WelcomeEmail } from './emails/welcome';

sgMail.setApiKey(process.env.SENDGRID_API_KEY);

// Render React component to HTML
const htmlContent = render(
  <WelcomeEmail userName="John" />
);

// Send with SendGrid
const msg = {
  to: 'user@example.com',
  from: 'hello@yourapp.com',
  subject: 'Welcome to Our App',
  html: htmlContent,
  trackingSettings: {
    clickTracking: { enable: true },
    openTracking: { enable: true }
  }
};

await sgMail.send(msg);
JSX Support

Via React Email

TypeScript

Good

Pricing

$20/mo

#6

Mailgun

Maximum Control

Powerful Email APIs with Granular Control

$35/mo

50,000 emails included

Mailgun has been a developer favorite for years, offering granular control over email delivery that appeals to engineers who want to understand exactly what is happening with their emails. The platform provides detailed logs, flexible routing, and comprehensive APIs that let you configure virtually every aspect of email delivery.

The official Node.js SDK includes TypeScript support with definitions that cover the core API functionality. While the DX is not as polished as newer entrants, the SDK is reliable and well-maintained. For React developers, the integration involves rendering JSX templates to HTML using React Email or similar libraries, then sending through the Mailgun API. This pattern works smoothly and gives you full control over both template development and delivery configuration.

Mailgun's strength for developers is the visibility it provides. You can trace individual emails through the entire delivery pipeline, see detailed SMTP responses, and understand exactly why emails bounced or were marked as spam. The log retention is generous, and the search functionality makes it easy to find specific messages or patterns. For debugging delivery issues or optimizing email performance, these tools are invaluable.

The webhook system is highly configurable, allowing you to subscribe to specific event types and route them to different endpoints. You can track opens, clicks, bounces, complaints, and delivery events with detailed metadata. For React developers building event-driven applications, this webhook flexibility integrates naturally with modern architectures using serverless functions or message queues.

Code Example

import Mailgun from 'mailgun.js';
import formData from 'form-data';
import { render } from '@react-email/render';
import { WelcomeEmail } from './emails/welcome';

const mailgun = new Mailgun(formData);
const mg = mailgun.client({
  username: 'api',
  key: process.env.MAILGUN_API_KEY
});

// Render React Email template
const html = render(
  <WelcomeEmail userName="John" />
);

// Send via Mailgun
const result = await mg.messages.create(
  'your-domain.com',
  {
    from: 'hello@your-domain.com',
    to: ['user@example.com'],
    subject: 'Welcome to Our App',
    html: html,
    'o:tracking': 'yes'
  }
);

console.log('Message ID:', result.id);
JSX Support

Via React Email

TypeScript

Good

Pricing

$35/mo

#7

Loops

SaaS Focused

Email for Modern SaaS with Clean APIs

$49/mo

5,000 contacts included

Loops is a newer email platform specifically designed for SaaS companies, combining transactional email capabilities with marketing automation in a clean, modern interface. For React developers, Loops offers a well-designed TypeScript SDK and REST API that integrate naturally with modern JavaScript applications, even though it does not have native JSX template support.

The TypeScript SDK follows modern conventions with properly typed methods and responses. You can track user events, trigger automated sequences, and send transactional emails through a consistent API interface. The type definitions are accurate and provide good IDE support, making integration feel natural in TypeScript projects. Error handling is clear, with distinct error types for different failure scenarios.

While Loops uses its own visual template builder rather than code-based templates, React developers can still use React Email to generate HTML and send it through the API. Alternatively, you can embrace Loops' template system and use the API to trigger template-based emails with dynamic variables. The platform handles the template rendering server-side, which can simplify your application architecture.

The platform's focus on SaaS workflows means it includes features that SaaS developers actually need: event-based triggers, user segmentation, behavioral analytics, and automated sequences. For React developers building B2B SaaS products, Loops provides a good balance between developer-friendly APIs and marketing team usability, reducing the tension that often exists between engineering and marketing needs.

Code Example

import { LoopsClient } from 'loops';

const loops = new LoopsClient(
  process.env.LOOPS_API_KEY
);

// Create or update a contact
await loops.createContact({
  email: 'user@example.com',
  firstName: 'John',
  userGroup: 'customers',
  customProperties: {
    plan: 'pro',
    signupDate: new Date().toISOString()
  }
});

// Send transactional email
await loops.sendTransactionalEmail({
  transactionalId: 'welcome_email',
  email: 'user@example.com',
  dataVariables: {
    firstName: 'John',
    loginUrl: 'https://app.example.com/login'
  }
});

// Track custom event
await loops.sendEvent({
  email: 'user@example.com',
  eventName: 'plan_upgraded',
  eventProperties: {
    oldPlan: 'free',
    newPlan: 'pro'
  }
});
JSX Support

Via API

TypeScript

Good

Pricing

$49/mo

#8

MJML

Industry Standard

The Markup Language for Responsive Email

Free

Open-source framework

MJML (Mailjet Markup Language) is a framework that abstracts away the complexity of creating responsive HTML emails. While MJML itself uses an XML-like syntax, the mjml-react library provides React bindings that let you write MJML components as JSX. This combination gives React developers a powerful way to create emails that render beautifully across all email clients.

The mjml-react library wraps MJML's component model in React components, maintaining the full power of MJML while providing a familiar JSX development experience. Components like Mjml, MjmlHead, MjmlBody, MjmlSection, MjmlColumn, MjmlText, and MjmlButton map directly to their MJML equivalents. You write JSX, and the library handles the compilation to MJML and then to email-compatible HTML.

TypeScript support comes from community-maintained type definitions that cover the core components. While not as comprehensive as native TypeScript implementations, the types are good enough for most use cases and continue to improve. The React bindings expose most MJML attributes as props, giving you IntelliSense support for available options.

MJML's responsive design system is particularly valuable for React developers who need emails to look good on mobile devices. The column-based layout system automatically handles responsive behavior, stacking columns on mobile without additional media queries. The built-in components handle spacing, typography, and button styling consistently across email clients, solving problems that would otherwise require extensive testing and client-specific hacks.

Code Example

import {
  Mjml,
  MjmlHead,
  MjmlTitle,
  MjmlBody,
  MjmlSection,
  MjmlColumn,
  MjmlText,
  MjmlButton,
  MjmlImage
} from 'mjml-react';
import { render } from 'mjml-react';

function WelcomeEmail({ userName, ctaUrl }) {
  return (
    <Mjml>
      <MjmlHead>
        <MjmlTitle>Welcome Email</MjmlTitle>
      </MjmlHead>
      <MjmlBody backgroundColor="#f4f4f4">
        <MjmlSection backgroundColor="#ffffff">
          <MjmlColumn>
            <MjmlImage
              src="https://acme.com/logo.png"
              width="150px"
            />
            <MjmlText fontSize="24px" fontWeight="bold">
              Welcome, {userName}!
            </MjmlText>
            <MjmlText>
              Thanks for signing up. Click below
              to get started.
            </MjmlText>
            <MjmlButton
              backgroundColor="#007bff"
              href={ctaUrl}
            >
              Get Started
            </MjmlButton>
          </MjmlColumn>
        </MjmlSection>
      </MjmlBody>
    </Mjml>
  );
}

// Render to HTML
const { html } = render(
  <WelcomeEmail userName="John" ctaUrl="..." />
);
JSX Support

Via mjml-react

TypeScript

Community

Pricing

Free

#9

Maizzle

Tailwind Native

Build Emails with Tailwind CSS

Free

Open-source framework

Maizzle is an email development framework that brings Tailwind CSS to email templates. For React developers who love Tailwind's utility-first approach, Maizzle offers a familiar way to style emails using the same classes you use in your web applications. The framework handles the complex process of inlining CSS and generating email-compatible HTML.

While Maizzle uses HTML templates rather than React components natively, the workflow fits well into React projects. You can use Maizzle to build and compile email templates as a build step, then import the resulting HTML into your React application. Some teams create a separate email package in their monorepo that exports compiled templates as string constants or template functions.

The Tailwind integration is comprehensive, with built-in handling for email-specific considerations. Maizzle automatically inlines CSS, removes unused styles, and generates both HTML and plain-text versions of your emails. The email-specific Tailwind configuration includes sensible defaults for email typography, spacing, and layout that account for email client limitations.

For developers already using Tailwind in their React applications, Maizzle's appeal is design consistency. You can use the same color palette, spacing scale, and typography settings across your web application and emails. The mental model of utility classes translates directly, reducing the context switching between app and email development. The build system is fast and integrates easily with existing toolchains.

Code Example

<!-- templates/welcome.html -->
<x-main>
  <table class="w-full">
    <tr>
      <td class="p-8 bg-white">
        <img src="logo.png"
             class="w-32 mx-auto mb-6"
             alt="Acme">

        <h1 class="text-2xl font-bold
                   text-gray-900 mb-4">
          Welcome, {{ name }}!
        </h1>

        <p class="text-gray-600 mb-6">
          We're excited to have you on board.
          Get started by exploring your dashboard.
        </p>

        <a href="{{ ctaUrl }}"
           class="inline-block px-6 py-3
                  bg-blue-600 text-white
                  font-semibold rounded">
          Go to Dashboard
        </a>
      </td>
    </tr>
  </table>
</x-main>

<!-- In React app, import compiled template -->
import welcomeTemplate from
  '@emails/dist/welcome.html';

// Use with any email provider
await sendEmail({
  html: welcomeTemplate
    .replace('{{ name }}', user.name)
    .replace('{{ ctaUrl }}', dashboardUrl)
});
JSX Support

Template-based

TypeScript

Configuration

Pricing

Free

#10

Mailing.run

Full Stack

Build, Test, and Send Emails with React

Free

Open-source, self-hosted

Mailing is an open-source tool that provides a complete email development environment for React developers. Unlike libraries that focus solely on template generation, Mailing includes a preview server, testing utilities, and development tools that create a full email development workflow. For teams that want complete control over their email infrastructure while using React components, Mailing offers a compelling self-hosted solution.

The React component approach in Mailing is similar to React Email but includes additional development tooling out of the box. The preview server launches automatically during development, showing rendered emails with hot reload as you make changes. You can preview how emails look across different screen sizes and switch between HTML and plain-text views. The development experience feels like working on a React web application.

TypeScript support is native throughout the framework. Component props are typed, the render functions return typed results, and the CLI tools work seamlessly with TypeScript projects. The configuration files support TypeScript, giving you type checking even for your email framework settings. For teams with strict TypeScript requirements, this comprehensive type coverage is valuable.

Mailing integrates with any email sending service through a simple render-to-HTML approach. You write your templates as React components, render them to HTML strings, and send through your provider of choice. The framework does not lock you into any particular email infrastructure, giving you flexibility to choose or change providers without rewriting templates.

Code Example

// emails/welcome.tsx
import { MjmlButton, MjmlColumn, MjmlSection,
         MjmlText } from 'mailing-core';

interface WelcomeEmailProps {
  name: string;
  ctaUrl: string;
}

export default function WelcomeEmail({
  name,
  ctaUrl
}: WelcomeEmailProps) {
  return (
    <MjmlSection>
      <MjmlColumn>
        <MjmlText>
          <h1>Welcome, {name}!</h1>
          <p>Thanks for signing up.</p>
        </MjmlText>
        <MjmlButton href={ctaUrl}>
          Get Started
        </MjmlButton>
      </MjmlColumn>
    </MjmlSection>
  );
}

// Preview: http://localhost:3883

// Usage in your app
import { render } from 'mailing-core';
import WelcomeEmail from './emails/welcome';

const html = render(
  <WelcomeEmail
    name="John"
    ctaUrl="https://app.com"
  />
);
JSX Support

Native

TypeScript

Native

Pricing

Free

#11

Email Octopus

Budget Friendly

Simple Email Marketing with Developer API

$9/mo

2,500 contacts included

Email Octopus offers affordable email marketing with a clean REST API that React developers can integrate for newsletter and marketing email needs. While it does not have native JSX template support, the API is straightforward enough that you can generate HTML with React Email or similar tools and send through their transactional API endpoints.

The REST API follows standard conventions and is well-documented with clear examples. For React developers, the typical integration pattern involves using React Email to build templates, rendering to HTML, and then using the Email Octopus API to send. This two-step approach works well and gives you full control over template design while benefiting from Email Octopus's affordable pricing and list management features.

TypeScript support comes from community-maintained type definitions and the REST API's predictable response formats. The API is simple enough that writing your own type definitions is straightforward if you need more comprehensive coverage. For teams on a budget who need basic email capabilities without the complexity of enterprise platforms, this simplicity is an advantage.

The platform's strength is value for money. At $9/month for 2,500 contacts, Email Octopus is significantly cheaper than most alternatives while providing the core features needed for SaaS email communications. The API includes contact management, campaign creation, and automation capabilities. For early-stage startups and indie developers who need to watch their budget, Email Octopus offers a practical starting point that can grow with your needs.

Code Example

// Using fetch with TypeScript
interface Contact {
  email_address: string;
  fields: Record<string, string>;
  status: 'SUBSCRIBED' | 'UNSUBSCRIBED';
}

async function addContact(contact: Contact) {
  const response = await fetch(
    `https://emailoctopus.com/api/1.6/lists/${listId}/contacts`,
    {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify({
        api_key: process.env.EMAILOCTOPUS_API_KEY,
        email_address: contact.email_address,
        fields: contact.fields,
        status: contact.status
      })
    }
  );
  return response.json();
}

// Send campaign with React-rendered HTML
import { render } from '@react-email/render';
import { Newsletter } from './emails/newsletter';

const html = render(<Newsletter />);

await fetch(
  'https://emailoctopus.com/api/1.6/campaigns',
  {
    method: 'POST',
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify({
      api_key: process.env.EMAILOCTOPUS_API_KEY,
      name: 'Weekly Newsletter',
      subject: 'This Week in Tech',
      from_name: 'Acme',
      from_email: 'news@acme.com',
      content: { html }
    })
  }
);
JSX Support

Via API

TypeScript

Community

Pricing

$9/mo

JSX vs Traditional Email Development

Why React developers are abandoning HTML tables and inline CSS for component-based email development.

Traditional Email HTML

  • - Nested HTML tables for layout
  • - Inline CSS on every element
  • - Client-specific hacks and conditionals
  • - No component reusability
  • - Manual testing across 50+ email clients
  • - String interpolation for dynamic content
  • - No type safety for template variables

React/JSX Email Development

  • + Semantic components (Container, Section, Column)
  • + CSS abstracted by components
  • + Cross-client compatibility built-in
  • + Full component composition and reuse
  • + Preview server with hot reload
  • + Props for dynamic content
  • + TypeScript interfaces for template props

TypeScript Email Development Best Practices

How to leverage TypeScript for safer, more maintainable email integrations in your React applications.

1. Type Your Email Template Props

Define interfaces for all email template props to catch missing or mistyped data at compile time.

interface WelcomeEmailProps {
  userName: string;
  userEmail: string;
  planName: 'free' | 'pro' | 'enterprise';
  trialEndsAt?: Date;
  features: string[];
}

export function WelcomeEmail({
  userName,
  userEmail,
  planName,
  trialEndsAt,
  features
}: WelcomeEmailProps) {
  return (
    <Html>
      <Body>
        <Text>Welcome, {userName}!</Text>
        {/* TypeScript ensures all props are used correctly */}
      </Body>
    </Html>
  );
}

2. Use SDK Types for API Calls

Leverage the TypeScript definitions provided by email SDKs for accurate request and response handling.

import { Resend, CreateEmailResponse } from 'resend';

const resend = new Resend(process.env.RESEND_API_KEY);

async function sendWelcomeEmail(
  to: string,
  props: WelcomeEmailProps
): Promise<CreateEmailResponse> {
  const { data, error } = await resend.emails.send({
    from: 'hello@app.com',
    to: [to],
    subject: 'Welcome!',
    react: WelcomeEmail(props)
  });

  if (error) {
    throw new Error(`Email failed: ${error.message}`);
  }

  return data;
}

3. Create Type-Safe Email Service Abstractions

Build a typed email service layer that encapsulates provider logic and ensures consistent usage.

type EmailTemplate =
  | { type: 'welcome'; props: WelcomeEmailProps }
  | { type: 'invoice'; props: InvoiceEmailProps }
  | { type: 'reset'; props: ResetPasswordProps };

class EmailService {
  async send(to: string, template: EmailTemplate) {
    switch (template.type) {
      case 'welcome':
        return this.sendWelcome(to, template.props);
      case 'invoice':
        return this.sendInvoice(to, template.props);
      case 'reset':
        return this.sendReset(to, template.props);
    }
  }
}

// Usage - TypeScript enforces correct props
await emailService.send('user@example.com', {
  type: 'welcome',
  props: { userName: 'John', /* ... */ }
});

Recommendations by Use Case

Different projects have different requirements. Here are our recommendations for common React developer scenarios.

Building a React SaaS Application

Primary: Sequenzy ($19/mo) - Native JSX templates, TypeScript SDK, and automatic Stripe integration for subscription emails. Eliminates webhook code for billing events and provides both transactional and marketing automation.

Alternative: Resend + React Email - Best-in-class developer experience for transactional email. Add Loops or Customer.io if you need marketing automation.

Open Source Project or Side Project

Primary: React Email + Resend Free Tier - React Email is free and open-source. Resend's free tier includes 3,000 emails/month. Perfect for small projects and learning.

Alternative: Mailing.run - Completely free and self-hosted. Full development environment with preview server. Great for learning JSX email development.

Enterprise React Application

Primary: SendGrid + React Email - Proven enterprise scale, comprehensive SDK coverage, Twilio backing. Use React Email for templates and SendGrid for delivery infrastructure.

Alternative: Postmark + React Email - If deliverability is the top priority, Postmark's focus on transactional email ensures maximum inbox placement.

Next.js Application with Tailwind

Primary: Maizzle + Any Provider - Build emails with the same Tailwind utility classes you use in your Next.js app. Consistent design language across all touchpoints.

Alternative: React Email with Tailwind Support - React Email now supports Tailwind classes, giving you JSX components with Tailwind styling.

Startup on a Budget

Primary: Sequenzy ($19/mo) - Best value for SaaS with up to 20,000 emails included. The billing integrations save significant development time that would otherwise be spent on webhook handlers.

Alternative: Email Octopus ($9/mo) - If you need basic email capabilities without React-specific features, Email Octopus is the most affordable option.

Frequently Asked Questions

Common questions about React email templates, TypeScript SDKs, JSX email development, and email components.

What are the best React email templates libraries in 2026?

The leading React email template libraries are React Email and mjml-react. React Email provides a clean component API with primitives like Container, Section, Text, Button, and Image that handle cross-client compatibility. It is actively maintained by the Resend team and has become the de facto standard. mjml-react wraps the MJML framework in React components, offering powerful responsive email capabilities. For teams already using Tailwind CSS, Maizzle provides a familiar utility-class approach to email styling. Mailing.run offers a full-stack solution with built-in preview server and testing tools.

How do I build email components in React?

Building email components in React requires using libraries specifically designed for email client compatibility. Standard React components will not render correctly in email clients because emails require HTML tables, inline CSS, and specific markup patterns. Use React Email or mjml-react to create components that abstract this complexity. Your components receive props like any React component, but the underlying markup is email-compatible. Import primitives from the library (Html, Body, Container, Section, Text, Button), compose them into templates, and render to HTML strings for sending.

Which email service has the best TypeScript SDK?

Resend and Sequenzy currently offer the best TypeScript SDKs with native types generated from their API specifications. Both provide comprehensive IntelliSense, accurate response types, and compile-time error checking. Resend's SDK is particularly well-designed with consistent patterns and excellent documentation. Sequenzy adds the benefit of native billing provider integrations for SaaS applications. Postmark and SendGrid also have good TypeScript support, though their types are not quite as refined. For maximum type safety in email development, pairing Resend or Sequenzy with React Email gives you end-to-end TypeScript coverage.

Can I use JSX to create email templates?

Yes, JSX is now the preferred way for React developers to create email templates. Libraries like React Email, mjml-react, and Mailing.run let you write emails as React components using familiar JSX syntax. These libraries provide components that render to email-compatible HTML, handling the complexity of tables, inline CSS, and email client quirks. You can use props for dynamic content, compose components for reusability, and leverage your existing React knowledge. The resulting components can be used with any email service that accepts HTML input.

How do I integrate React Email with TypeScript?

React Email has native TypeScript support with comprehensive type definitions. Install the package with npm or yarn, and TypeScript will recognize all component props and render functions automatically. Create your email components as .tsx files, define prop interfaces for type safety, and use the render function to convert to HTML. The types cover all built-in components (Html, Body, Container, Section, Row, Column, Text, Button, Link, Image, etc.) with accurate prop definitions. IDE autocomplete will show available props and their types as you build templates.

What is the best way to preview JSX email templates during development?

React Email includes a development server that provides live preview as you build templates. Run the dev command to start a local server that renders your email components in the browser with hot reload. You can switch between HTML and source views, check different screen sizes, and verify rendering without sending actual emails. Mailing.run offers similar functionality with additional testing utilities. For teams not using these frameworks, you can build a simple Next.js or Vite page that imports and renders your email components for preview purposes.

How do TypeScript types improve email development?

TypeScript types catch errors before they reach production, which is especially valuable for email code that is harder to test than UI code. With typed email SDKs, you will catch issues like misspelled properties, missing required fields, and incorrect data types at compile time. When building email templates with React Email or mjml-react, types ensure component props match expected values. When calling email APIs with Resend or Sequenzy, types verify request structures and help handle response data correctly. This compile-time checking significantly reduces the debugging cycle for email integrations.

Can I share React components between my app and email templates?

You can share design tokens, styles, and some logic between your app and emails, but email components must use email-specific primitives. Create a shared constants file for colors, fonts, and spacing values used across both contexts. Build email-specific versions of common UI elements (buttons, cards, etc.) that use React Email components internally but accept similar props to your app components. Some teams maintain parallel component libraries - one for web and one for email - that share styling conventions while using appropriate rendering approaches for each medium.

What is the best email API for React developers building SaaS products?

For React developers building SaaS products, Sequenzy offers the best combination of developer experience and SaaS-specific features. The native TypeScript SDK provides excellent type safety, and the JSX template support lets you build emails as React components. The standout feature is native integration with Stripe, Polar, and other billing providers, automatically triggering email sequences for subscription events without custom webhook code. For pure transactional email with the best DX but no marketing automation, Resend with React Email is the standard choice. Loops offers a good middle ground with SaaS-focused features and clean APIs.

How do I handle email template testing with React and TypeScript?

Testing React email templates involves several layers: unit tests for component logic, visual regression tests for rendering, and integration tests for delivery. For unit tests, render your React Email components and assert on the output HTML structure. Tools like Jest or Vitest work well for this. For visual testing, use the React Email preview server during development or set up automated screenshot comparisons. For integration testing, use sandbox modes provided by your email service (Resend, Postmark, etc.) that accept emails but do not deliver them. TypeScript's compile-time checking catches many issues before tests even run.

Quick Start: React Email in 5 Minutes

Get up and running with JSX email templates in your React project.

Step 1: Install Dependencies

# Install React Email components
npm install @react-email/components

# Install your email provider SDK
npm install resend
# or
npm install @sequenzy/sdk

Step 2: Create Your First Email Template

// emails/welcome.tsx
import {
  Html, Body, Container, Heading, Text, Button
} from '@react-email/components';

interface WelcomeEmailProps {
  userName: string;
}

export function WelcomeEmail({ userName }: WelcomeEmailProps) {
  return (
    <Html>
      <Body style={{ fontFamily: 'sans-serif' }}>
        <Container>
          <Heading>Welcome, {userName}!</Heading>
          <Text>Thanks for signing up.</Text>
          <Button href="https://app.com/dashboard">
            Go to Dashboard
          </Button>
        </Container>
      </Body>
    </Html>
  );
}

Step 3: Send Your Email

// api/send-welcome.ts
import { Resend } from 'resend';
import { WelcomeEmail } from '@/emails/welcome';

const resend = new Resend(process.env.RESEND_API_KEY);

export async function sendWelcomeEmail(userEmail: string, userName: string) {
  await resend.emails.send({
    from: 'hello@yourapp.com',
    to: userEmail,
    subject: 'Welcome to Our App!',
    react: WelcomeEmail({ userName })
  });
}

Step 4: Preview During Development

# Add preview script to package.json
{
  "scripts": {
    "email:dev": "email dev"
  }
}

# Run the preview server
npm run email:dev

# Open http://localhost:3000 to preview emails

Ready to Build Email with React?

For most React developers, we recommend starting with Sequenzy for its combination of JSX support, TypeScript SDK, and SaaS-focused features like Stripe integration. At $19/month for up to 20,000 emails, it provides excellent value while eliminating hours of webhook boilerplate.

Try Sequenzy Free Compare All Email Tools

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