head to head · open source
Sentry vs monoscope
Sentry has 44,806 GitHub stars, 4,857 forks, 2,265 open issues and last shipped today. monoscope has 1,817 stars, 75 forks, 32 open issues and last shipped today. Sentry leads on adoption by 2,366% (44,806 vs 1,817 stars). Sentry is written in Python under a custom or non-standard licence; monoscope is written in Haskell under AGPL-3.0. Sentry has attracted 11% as many forks as stars, monoscope 4%. 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 | monoscope | |
|---|---|---|
| GitHub stars | ★ 45K | ★ 1.8K |
| License | Custom / other | AGPL-3.0 |
| Written in | Python | Haskell |
| Last push | 2026-09-20 | 2026-09-20 |
| Forks | ⑂ 4.9K | ⑂ 75 |
| 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 monoscope if
- You want the monoscope feature set and don't need the biggest community
- You prefer the AGPL-3.0 license terms
- Your stack matches Haskell
- You evaluated both and monoscope 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 monoscope
Monoscope is an open source observability platform written in Haskell and licensed under AGPL 3.0. It ingests and explores logs, traces, and metrics, and stores telemetry in S3 compatible buckets. It supports OpenTelemetry ingestion and can be used as a self hosted or cloud service.
read the full monoscope overview →
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Frequently asked questions
Is Sentry or monoscope more popular?
Sentry has 44,806 GitHub stars and monoscope has 1,817. Sentry has the larger community by that measure.
Are Sentry and monoscope free?
Both are open source. Sentry has no licence declared in this registry, and monoscope is licensed under AGPL-3.0. Both are free to self-host.
What is the difference between Sentry and monoscope?
Sentry is written in Python and monoscope in Haskell. 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 monoscope?
Choose Sentry if you want the larger community (44,806 stars) or its Custom / other licence terms. Choose monoscope if its feature set, stack or AGPL-3.0 licence fits better. Both are self-hostable.