head to head · open source
fingerprintjs vs Harper
fingerprintjs has 28,466 GitHub stars, 2,621 forks, 19 open issues and last shipped yesterday. Harper has 15,469 stars, 632 forks, 896 open issues and last shipped yesterday. fingerprintjs leads on adoption by 84% (28,466 vs 15,469 stars). fingerprintjs is written in TypeScript under MIT; Harper is written in Rust under Apache-2.0. fingerprintjs has attracted 9% as many forks as stars, Harper 4%. Harper 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
| fingerprintjs | Harper | |
|---|---|---|
| GitHub stars | ★ 28K | ★ 15K |
| License | MIT | Apache-2.0 |
| Written in | TypeScript | Rust |
| Last push | 2026-09-17 | 2026-09-17 |
| Forks | ⑂ 2.6K | ⑂ 632 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick fingerprintjs if
- You weight community size — 28K stars and counting
- You want the MIT license terms
- Your stack matches TypeScript
- You value the larger contributor base for long-term maintenance
pick Harper if
- You want the Harper feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Rust
- You evaluated both and Harper fits your workflow better
About fingerprintjs
FingerprintJS is an open source, client side browser fingerprinting library that queries browser attributes and computes a hashed visitor identifier from them, aimed at web developers and engineering teams that need to recognise returning browsers without depending on cookies or local storage.
read the full fingerprintjs overview →
About Harper
Harper is offline, privacy first grammar checker for English. It lives in productivity, browser extension, developer tools, and text editing ecosystem. Project is open source under Apache 2.0. GitHub metadata shows 15373 stars, 627 forks, and 896 open issues. Last push is 2026 09 14. Category is Productivity & Utilities / Browsers & Extensions. It uses Rust for core, WebAssembly for browser loading, language server for editors, JavaScript package for web and Node.js apps. It solves slow, costly, network dependent grammar checking. It replaces Grammarly and LanguageTool as named in README. Grammarly sends writing …
read the full Harper overview →
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Frequently asked questions
Is fingerprintjs or Harper more popular?
fingerprintjs has 28,466 GitHub stars and Harper has 15,469. fingerprintjs has the larger community by that measure.
Are fingerprintjs and Harper free?
Both are open source. fingerprintjs is licensed under MIT and Harper under Apache-2.0. Neither carries a licence fee.
What is the difference between fingerprintjs and Harper?
fingerprintjs is written in TypeScript and Harper 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, fingerprintjs or Harper?
Choose fingerprintjs if you want the larger community (28,466 stars) or its MIT licence terms. Choose Harper if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.