head to head · open source
Sentry vs client_js
Sentry has 44,806 GitHub stars, 4,857 forks, 2,265 open issues and last shipped today. client_js has 3,489 stars, 430 forks, 50 open issues and last shipped 3 days ago. Sentry leads on adoption by 1,184% (44,806 vs 3,489 stars). Sentry is written in Python under a custom or non-standard licence; client_js is written in JavaScript under Apache-2.0. Sentry has attracted 11% as many forks as stars, client_js 12%. Sentry was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (monitoring), so they are genuine substitutes rather than adjacent tools.
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
| Sentry | client_js | |
|---|---|---|
| GitHub stars | ★ 45K | ★ 3.5K |
| License | Custom / other | Apache-2.0 |
| Written in | Python | JavaScript |
| Last push | 2026-09-20 | 2026-09-17 |
| Forks | ⑂ 4.9K | ⑂ 430 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Sentry if
- You weight community size — 45K stars and counting
- You want the Custom / other license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick client_js if
- You want the client_js feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches JavaScript
- You evaluated both and client_js fits your workflow better
About Sentry
Sentry is an open source debugging platform for detecting, tracing, and fixing software issues in real time. It lives in the developer infrastructure ecosystem and provides error tracking and performance monitoring across languages, frameworks, and runtime environments.
read the full Sentry overview →
About client_js
client js is the official Prometheus client library for Node.js, published on npm as @prometheus io/client , which lets JavaScript services expose counters, gauges, histograms and summaries for a Prometheus server to scrape.
read the full client_js overview →
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Frequently asked questions
Is Sentry or client_js more popular?
Sentry has 44,806 GitHub stars and client_js has 3,489. Sentry has the larger community by that measure.
Are Sentry and client_js free?
Both are open source. Sentry has no licence declared in this registry, and client_js is licensed under Apache-2.0. Both are free to self-host.
What is the difference between Sentry and client_js?
Sentry is written in Python and client_js 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, Sentry or client_js?
Choose Sentry if you want the larger community (44,806 stars) or its Custom / other licence terms. Choose client_js if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.