head to head · open source
Zen Browser vs hermes-browser-extension
Zen Browser has 44,486 GitHub stars, 1,755 forks, 689 open issues and last shipped yesterday. hermes-browser-extension has 1,540 stars, 145 forks, 15 open issues and last shipped 2 days ago. Zen Browser leads on adoption by 2,789% (44,486 vs 1,540 stars). Zen Browser is written in C++ under MPL-2.0; hermes-browser-extension is written in JavaScript under MIT. Zen Browser has attracted 4% as many forks as stars, hermes-browser-extension 9%. Zen Browser 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 | hermes-browser-extension | |
|---|---|---|
| GitHub stars | ★ 44K | ★ 1.5K |
| License | MPL-2.0 | MIT |
| Written in | C++ | JavaScript |
| Last push | 2026-09-17 | 2026-09-16 |
| Forks | ⑂ 1.8K | ⑂ 145 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Zen Browser if
- You weight community size — 44K 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 hermes-browser-extension if
- You want the hermes-browser-extension feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches JavaScript
- You evaluated both and hermes-browser-extension fits your workflow better
About Zen Browser
Zen Browser is a privacy focused, open source web browser built on Firefox’s Gecko engine. It inherits Firefox’s compatibility and extension ecosystem while introducing a streamlined interface and productivity oriented features. The project lives in the desktop browser ecosystem, targeting users who want a Firefox based experience with reduced clutter and enhanced customization.
read the full Zen Browser overview →
About hermes-browser-extension
Hermes Browser Extension Browser native side panel for Hermes Agent — connect active web context through a local gateway, Hermes Cloud, or a self hosted remote gateway. Created by Jon Komet ( @abundantbeing ). Community extension for Hermes Agent by Nous Research. Public v0.3.2 · Load unpacked · Local / Hermes Cloud / Remote · Full Hermes runtime tools Not on the Chrome Web Store yet. What it is Hermes Browser Extension is not a browser chatbot. It is a Chrome/Edge/Chromium side panel for the real Hermes Agent runtime. Choose a local gateway, attach to a signed in Hermes Cloud agent tab, or connect to a self host…
read the full hermes-browser-extension overview →
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Frequently asked questions
Is Zen Browser or hermes-browser-extension more popular?
Zen Browser has 44,486 GitHub stars and hermes-browser-extension has 1,540. Zen Browser has the larger community by that measure.
Are Zen Browser and hermes-browser-extension free?
Both are open source. Zen Browser is licensed under MPL-2.0 and hermes-browser-extension under MIT. Neither carries a licence fee.
What is the difference between Zen Browser and hermes-browser-extension?
Zen Browser is written in C++ and hermes-browser-extension 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 hermes-browser-extension?
Choose Zen Browser if you want the larger community (44,486 stars) or its MPL-2.0 licence terms. Choose hermes-browser-extension if its feature set, stack or MIT licence fits better. Both are self-hostable.