head to head · open source
serenity vs mocha
serenity has 33,840 GitHub stars, 3,541 forks, 739 open issues and last shipped yesterday. mocha has 22,894 stars, 3,151 forks, 222 open issues and last shipped yesterday. serenity leads on adoption by 48% (33,840 vs 22,894 stars). serenity is written in C++ under BSD-2-Clause; mocha is written in JavaScript under MIT. serenity has attracted 10% as many forks as stars, mocha 14%. mocha was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (browser), so they are genuine substitutes rather than adjacent tools.
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
| serenity | mocha | |
|---|---|---|
| GitHub stars | ★ 34K | ★ 23K |
| License | BSD-2-Clause | MIT |
| Written in | C++ | JavaScript |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 3.5K | ⑂ 3.2K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick serenity if
- You weight community size — 34K stars and counting
- You want the BSD-2-Clause license terms
- Your stack matches C++
- You value the larger contributor base for long-term maintenance
pick mocha if
- You want the mocha feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and mocha fits your workflow better
About serenity
SerenityOS is a graphical Unix like operating system built for 64 bit x86, Arm, and RISC V computers. It is written in C++ and released under the BSD 2 Clause license, and it lives in the open source operating system ecosystem alongside other hobbyist and research kernels. The project describes itself as a love letter to 1990s user interfaces paired with a custom Unix like core, aiming for a marriage between the aesthetic of late 1990s productivity software and the power user accessibility of late 2000s Unix systems.
read the full serenity overview →
About mocha
Mocha is a classic, reliable and trusted test framework for Node.js and the browser, distributed as an open source JavaScript module under the MIT licence and aimed at JavaScript developers and package maintainers who need to write and run automated tests inside a Node.js process or in a browser environment.
read the full mocha overview →
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Frequently asked questions
Is serenity or mocha more popular?
serenity has 33,840 GitHub stars and mocha has 22,894. serenity has the larger community by that measure.
Are serenity and mocha free?
Both are open source. serenity is licensed under BSD-2-Clause and mocha under MIT. Neither carries a licence fee.
What is the difference between serenity and mocha?
serenity is written in C++ and mocha in JavaScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, serenity or mocha?
Choose serenity if you want the larger community (33,840 stars) or its BSD-2-Clause licence terms. Choose mocha if its feature set, stack or MIT licence fits better. Both are self-hostable.