head to head · open source
Zen Browser vs mocha
Zen Browser has 45,517 GitHub stars, 1,946 forks, 689 open issues and last shipped yesterday. mocha has 22,912 stars, 3,144 forks, 222 open issues and last shipped yesterday. Zen Browser leads on adoption by 99% (45,517 vs 22,912 stars). Zen Browser is written in C++ under MPL-2.0; mocha is written in JavaScript under MIT. Zen Browser has attracted 4% 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.
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
| Zen Browser | mocha | |
|---|---|---|
| GitHub stars | ★ 46K | ★ 23K |
| License | MPL-2.0 | MIT |
| Written in | C++ | JavaScript |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 1.9K | ⑂ 3.1K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Zen Browser if
- You weight community size — 46K stars and counting
- You want the MPL-2.0 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 Zen Browser
Zen Browser Zen is a firefox based browser with the aim of pushing your productivity to a new level! Download • Website • Documentation • Release Notes Firefox Versions Release Is currently built using Firefox version 155.0.1 ! Twilight Is currently built using Firefox version RC 155.0.1 ! Contributing If you'd like to report a bug, please do so on our GitHub Issues page and for feature requests, you can use GitHub Discussions. Zen is an open source project, and we welcome contributions from the community! Please take a look at the contribution guidelines before getting started! Partners Thanks to all the…
read the full Zen Browser overview →
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 Zen Browser or mocha more popular?
Zen Browser has 45,517 GitHub stars and mocha has 22,912. Zen Browser has the larger community by that measure.
Are Zen Browser and mocha free?
Both are open source. Zen Browser is licensed under MPL-2.0 and mocha under MIT. Neither carries a licence fee.
What is the difference between Zen Browser and mocha?
Zen Browser 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, Zen Browser or mocha?
Choose Zen Browser if you want the larger community (45,517 stars) or its MPL-2.0 licence terms. Choose mocha if its feature set, stack or MIT licence fits better. Both are self-hostable.