head to head · open source
servo vs mocha
servo has 38,001 GitHub stars, 3,798 forks, 3,209 open issues and last shipped yesterday. mocha has 22,894 stars, 3,151 forks, 222 open issues and last shipped yesterday. servo leads on adoption by 66% (38,001 vs 22,894 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 | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 3.8K | ⑂ 3.2K |
| 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
Servo is a prototype web browser engine written in the Rust programming language. It is developed on 64 bit macOS, 64 bit Linux, 64 bit Windows, 64 bit OpenHarmony, and Android, and it lives in the Rust ecosystem as an open source project licensed under MPL 2.0. The repository carries the topics browser, rust, servo, web, webbrowser, webengine, and webplatform, and the project describes itself as aiming to empower developers with a lightweight, high performance alternative for embedding web technologies in applications. Documentation lives in the Servo Book, with news and guides at servo.org.
read the full servo 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 servo or mocha more popular?
servo has 38,001 GitHub stars and mocha has 22,894. 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 (38,001 stars) or its MPL-2.0 licence terms. Choose mocha if its feature set, stack or MIT licence fits better. Both are self-hostable.