head to head · open source
servo vs mocha
servo has 38,301 GitHub stars, 3,865 forks, 3,209 open issues and last shipped yesterday. mocha has 22,912 stars, 3,144 forks, 222 open issues and last shipped yesterday. servo leads on adoption by 67% (38,301 vs 22,912 stars). servo is written in Rust under MPL-2.0; mocha is written in JavaScript under MIT. servo has attracted 10% as many forks as stars, mocha 14%. servo 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
| servo | mocha | |
|---|---|---|
| GitHub stars | ★ 38K | ★ 23K |
| License | MPL-2.0 | MIT |
| Written in | Rust | JavaScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 3.9K | ⑂ 3.1K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick servo if
- You weight community size — 38K stars and counting
- You want the MPL-2.0 license terms
- Your stack matches Rust
- 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 servo
The Servo Parallel Browser Engine Project Servo is a prototype web browser engine written in the Rust language. It is currently developed on 64 bit macOS, 64 bit Linux, 64 bit Windows, 64 bit OpenHarmony, and Android. Servo welcomes contribution from everyone. Check out: The Servo Book for documentation servo.org for news and guides Coordination of Servo development happens: Here in the Github Issues On the Servo Zulip In video calls advertised in the Servo Project repo. Getting started For more detailed build instructions, see the Servo Book under [Getting the Code] and [Building Servo]. [Getting the Code]…
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About mocha
☕️ Classic, reliable, trusted test framework for Node.js and the browser ☕️ Links Documentation Release Notes / History / Changes Code of Conduct Contributing Development Discord (ask questions here!) Issue Tracker Backers Become a backer and show your support to our open source project on our site. Sponsors Does your company use Mocha? Ask your manager or marketing team if your company would be interested in supporting our project. Support will allow the maintainers to dedicate more time for maintenance and new features for everyone. Also, your company's logo will show on GitHub and on our site who doesn't want…
read the full mocha overview →
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Frequently asked questions
Is servo or mocha more popular?
servo has 38,301 GitHub stars and mocha has 22,912. servo has the larger community by that measure.
Are servo and mocha free?
Both are open source. servo is licensed under MPL-2.0 and mocha under MIT. Neither carries a licence fee.
What is the difference between servo and mocha?
servo is written in Rust 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, servo or mocha?
Choose servo if you want the larger community (38,301 stars) or its MPL-2.0 licence terms. Choose mocha if its feature set, stack or MIT licence fits better. Both are self-hostable.