head to head · open source
uBlock vs servo
uBlock has 67,923 GitHub stars, 4,353 forks, 15 open issues and last shipped yesterday. servo has 38,001 stars, 3,798 forks, 3,209 open issues and last shipped yesterday. uBlock leads on adoption by 79% (67,923 vs 38,001 stars). uBlock is written in JavaScript under GPL-3.0; servo is written in Rust under MPL-2.0. uBlock has attracted 6% as many forks as stars, servo 10%. uBlock 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
| uBlock | servo | |
|---|---|---|
| GitHub stars | ★ 68K | ★ 38K |
| License | GPL-3.0 | MPL-2.0 |
| Written in | JavaScript | Rust |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 4.4K | ⑂ 3.8K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick uBlock if
- You weight community size — 68K stars and counting
- You want the GPL-3.0 license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick servo if
- You want the servo feature set and don't need the biggest community
- You prefer the MPL-2.0 license terms
- Your stack matches Rust
- You evaluated both and servo fits your workflow better
About uBlock
uBlock Origin is a CPU and memory efficient, wide spectrum content blocker for Chromium and Firefox, aimed at anyone who wants ads, trackers, coin miners, popups, anti blockers and malware sites neutralised by default without hand tuning anything.
read the full uBlock overview →
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 →
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Frequently asked questions
Is uBlock or servo more popular?
uBlock has 67,923 GitHub stars and servo has 38,001. uBlock has the larger community by that measure.
Are uBlock and servo free?
Both are open source. uBlock is licensed under GPL-3.0 and servo under MPL-2.0. Neither carries a licence fee.
What is the difference between uBlock and servo?
uBlock is written in JavaScript and servo in Rust. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, uBlock or servo?
Choose uBlock if you want the larger community (67,923 stars) or its GPL-3.0 licence terms. Choose servo if its feature set, stack or MPL-2.0 licence fits better. Both are self-hostable.