MJML vs React Email: Developer Email Frameworks Compared

Framework Overview

MJML (Mailjet Markup Language) is an open-source markup language that compiles to responsive, email-client-compatible HTML. It has been around since 2015 and has a mature ecosystem with extensive documentation and community support.

React Email is a newer entrant that brings React's component model to email development. Write emails as React components with JSX, use props for dynamic content, and benefit from TypeScript support. It is particularly appealing to teams already working in React.

Syntax Comparison

MJML Example

<mjml>
  <mj-body>
    <mj-section>
      <mj-column>
        <mj-text>Hello World</mj-text>
        <mj-button href="https://example.com">
          Click Me
        </mj-button>
      </mj-column>
    </mj-section>
  </mj-body>
</mjml>

React Email Example

import { Html, Section, Text, Button } from '@react-email/components';

export default function Email() {
  return (
    <Html>
      <Section>
        <Text>Hello World</Text>
        <Button href="https://example.com">
          Click Me
        </Button>
      </Section>
    </Html>
  );
}

Key Differences

Developer Experience

MJML Developer Experience

• Simple syntax that anyone can learn quickly
• Online editor available for quick testing
• VS Code extension with preview and validation
• CLI tool for build integration
• Language-agnostic, works with any stack

React Email Developer Experience

• Full TypeScript support with type checking
• Component composition like regular React
• Hot reload preview during development
• Integrates with existing React tooling
• Props for dynamic content and theming

Email Client Compatibility

MJML: Battle-tested across email clients over many years. The generated HTML is specifically designed for maximum compatibility, including notoriously difficult clients like Outlook.

React Email: Very good compatibility, though slightly less proven than MJML's years of refinement. The team actively tests across clients, but edge cases may arise.

Ecosystem and Integration

MJML: Works with any backend or frontend stack. Compile MJML to HTML and use anywhere. Integrations exist for major frameworks and build tools.

React Email: Tightly coupled with React ecosystem. Pairs naturally with Resend for sending but works with other providers. Best suited for React-based projects.

Recommendation

For developers who prefer clean, simple syntax and want maximum email client reliability, MJML is the established choice. For React developers who want to leverage their existing skills and enjoy component-based architecture, React Email offers a modern alternative.

Build Pipeline and Team Ownership

Both tools expect engineers to own email markup, but the operational shape differs. MJML is a compiler: install the CLI, run it in CI, treat the output like a build artifact. Anything that can shell out can compile it — Node, Ruby, Python projects all integrate it. React Email imports naturally into a React app; your email components live inside the same repository as product code, and preview via its dev server.

Pricing and Cost Model

Both MJML and React Email cost nothing as MIT-licensed open source, so this comparison is mostly about engineering time rather than licensing. The recurring costs are: developer hours for building and maintaining templates, spending time on a preview tool, and — either way — a sending provider with its own usage-based pricing. Neither tool has hidden pricing tiers; whatever bill you receive will come from the sending platform, not the template layer.

If you use a commercial email delivery service, always check the official pricing pages of that provider for current rate limits and tiers before committing; volume thresholds and daily caps shift regularly.

MJML vs React Email FAQ