head to head · open source
react vs mailcatcher
react has 251,968 GitHub stars, 51,706 forks, 1,377 open issues and last shipped 2 days ago. mailcatcher has 6,784 stars, 605 forks, 43 open issues and last shipped 9 days ago. react leads on adoption by 3,614% (251,968 vs 6,784 stars). react is written in JavaScript under MIT; mailcatcher is written in Ruby under MIT. react has attracted 21% as many forks as stars, mailcatcher 9%. react 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.
← all 20902 open source comparisons
Side by side
| react | mailcatcher | |
|---|---|---|
| GitHub stars | ★ 252K | ★ 6.8K |
| License | MIT | MIT |
| Written in | JavaScript | Ruby |
| Last push | 2026-11-04 | 2026-10-28 |
| Forks | ⑂ 52K | ⑂ 605 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick react if
- You weight community size — 252K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- 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 react
React · React is a JavaScript library for building user interfaces. Declarative: React makes it painless to create interactive UIs. Design simple views for each state in your application, and React will efficiently update and render just the right components when your data changes. Declarative views make your code more predictable, simpler to understand, and easier to debug. Component Based: Build encapsulated components that manage their own state, then compose them to make complex UIs. Since component logic is written in JavaScript instead of templates, you can easily pass rich data through your app and…
read the full react overview →
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 →
More in Developer Tools
Related comparisons
More Frameworks & Platforms projects
Compare either of these against the rest of the Frameworks & Platforms field.
Frequently asked questions
Is react or mailcatcher more popular?
react has 251,968 GitHub stars and mailcatcher has 6,784. react has the larger community by that measure.
Are react and mailcatcher free?
Both are open source. react is licensed under MIT and mailcatcher under MIT. Neither carries a licence fee.
What is the difference between react and mailcatcher?
react is written in JavaScript 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, react or mailcatcher?
Choose react if you want the larger community (251,968 stars) or its MIT licence terms. Choose mailcatcher if its feature set, stack or MIT licence fits better. Both are self-hostable.