head to head · open source
rea vs mailcatcher
rea has 431,575 GitHub stars, 107,264 forks, 70 open issues and last shipped 2 days ago. mailcatcher has 6,784 stars, 605 forks, 43 open issues and last shipped 9 days ago. rea leads on adoption by 6,262% (431,575 vs 6,784 stars). rea is written in TypeScript under MIT; mailcatcher is written in Ruby under MIT. rea has attracted 25% as many forks as stars, mailcatcher 9%. rea was the more recently maintained of the two, and both are self-hostable with no licence fee.
Two open source projects, one decision. Both are free and self-hostable — the differences are community size, license terms, language stack and release pace.
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Side by side
| rea | mailcatcher | |
|---|---|---|
| GitHub stars | ★ 432K | ★ 6.8K |
| License | MIT | MIT |
| Written in | TypeScript | Ruby |
| Last push | 2026-11-04 | 2026-10-28 |
| Forks | ⑂ 107K | ⑂ 605 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick rea if
- You weight community size — 432K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick mailcatcher if
- You want the mailcatcher feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Ruby
- You evaluated both and mailcatcher fits your workflow better
About rea
English · 简体中文 · 繁體中文 · 日本語 · 한국어 · Türkçe · Русский · Tiếng Việt · ไทย · Deutsch · Español · Français · Українська · Polski · Português (Brasil) · العربية · فارسی REA: Reverse Engineer Anything One MCP for reverse engineering across binaries, applications, and runtime behavior. See a feature you like. Understand how it works, down to the binary level. Website · Guides · Showcases Quick start · How REA works · What you can analyze · Showcases · FAQ · Documentation npx rea agents setup Join the Reverse Engineering Community Discord · Q&A · Show and Tell See a feature in an app that you want in your own product?…
About mailcatcher
MailCatcher Catches mail and serves it through a dream. MailCatcher runs a super simple SMTP server which catches any message sent to it to display in a web interface. Run mailcatcher, set your favourite app to deliver to smtp://127.0.0.1:1025 instead of your default SMTP server, then check out to see the mail that's arrived so far. Features Catches all mail and stores it for display. Shows HTML, Plain Text and Source version of messages, as applicable. Rewrites HTML enabling display of embedded, inline images/etc and opens links in a new window. Lists attachments and allows separate downloading of parts…
read the full mailcatcher overview →
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Frequently asked questions
Is rea or mailcatcher more popular?
rea has 431,575 GitHub stars and mailcatcher has 6,784. rea has the larger community by that measure.
Are rea and mailcatcher free?
Both are open source. rea is licensed under MIT and mailcatcher under MIT. Neither carries a licence fee.
What is the difference between rea and mailcatcher?
rea is written in TypeScript and mailcatcher in Ruby. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, rea or mailcatcher?
Choose rea if you want the larger community (431,575 stars) or its MIT licence terms. Choose mailcatcher if its feature set, stack or MIT licence fits better. Both are self-hostable.