head to head · open source
uBlock vs servo
uBlock has 69,033 GitHub stars, 4,427 forks, 15 open issues and last shipped yesterday. servo has 38,301 stars, 3,865 forks, 3,209 open issues and last shipped yesterday. uBlock leads on adoption by 80% (69,033 vs 38,301 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 | ★ 69K | ★ 38K |
| License | GPL-3.0 | MPL-2.0 |
| Written in | JavaScript | Rust |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 4.4K | ⑂ 3.9K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick uBlock if
- You weight community size — 69K 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
[![Badge Commits]][Commit Rate] [![Badge Issues]][Issues] [![Badge Localization]][Crowdin] [![Badge License]][License] [![Badge NPM]][NPM] [![Badge Mozilla]][Mozilla] ![Badge Chrome] [![Badge Edge]][Edge] uBlock Origin (uBO) GitHub Releases Stable and development versions on Firefox, Chromium MV2, and Thunderbird. Must be placed manually into web browsers; the Chromium and Thunderbird versions usually won't auto update. Related: uBlock Origin Lite uBlock Origin (uBO) is a CPU and memory efficient [wide spectrum content blocker][Blocking] for Chromium and Firefox. It blocks ads, trackers, coin miners, popups…
read the full uBlock overview →
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]…
read the full servo overview →
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Frequently asked questions
Is uBlock or servo more popular?
uBlock has 69,033 GitHub stars and servo has 38,301. 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 (69,033 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.