head to head · open source
Sentry vs frostmourne
Sentry has 44,806 GitHub stars, 4,857 forks, 2,265 open issues and last shipped today. frostmourne has 1,494 stars, 317 forks, 31 open issues and last shipped 5 months ago. Sentry leads on adoption by 2,899% (44,806 vs 1,494 stars). Sentry is written in Python under a custom or non-standard licence; frostmourne is written in Java under MIT. Sentry has attracted 11% as many forks as stars, frostmourne 21%. Sentry was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (monitor), 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 | frostmourne | |
|---|---|---|
| GitHub stars | ★ 45K | ★ 1.5K |
| License | Custom / other | MIT |
| Written in | Python | Java |
| Last push | 2026-09-20 | 2026-04-17 |
| Forks | ⑂ 4.9K | ⑂ 317 |
| 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 frostmourne if
- You want the frostmourne feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Java
- You evaluated both and frostmourne 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 frostmourne
Frostmourne（霜之哀伤监控平台）is an MIT licensed, Java based distributed monitoring and alerting system that turns queries against Elasticsearch, Prometheus, SkyWalking, InfluxDB, MySQL/TiDB, ClickHouse, SqlServer and IoTDB data into alarms, and it is built for operations and development teams that already run a log or metrics stack but lack a matching alerting layer.
read the full frostmourne overview →
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Frequently asked questions
Is Sentry or frostmourne more popular?
Sentry has 44,806 GitHub stars and frostmourne has 1,494. Sentry has the larger community by that measure.
Are Sentry and frostmourne free?
Both are open source. Sentry has no licence declared in this registry, and frostmourne is licensed under MIT. Both are free to self-host.
What is the difference between Sentry and frostmourne?
Sentry is written in Python and frostmourne in Java. 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 frostmourne?
Choose Sentry if you want the larger community (44,806 stars) or its Custom / other licence terms. Choose frostmourne if its feature set, stack or MIT licence fits better. Both are self-hostable.