head to head · open source
Sentry vs transmittable-thread-local
Sentry has 44,806 GitHub stars, 4,857 forks, 2,265 open issues and last shipped today. transmittable-thread-local has 8,308 stars, 1,723 forks, 57 open issues and last shipped 3 months ago. Sentry leads on adoption by 439% (44,806 vs 8,308 stars). Sentry is written in Python under a custom or non-standard licence; transmittable-thread-local is written in Java under Apache-2.0. Sentry has attracted 11% as many forks as stars, transmittable-thread-local 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 (apm), 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 | transmittable-thread-local | |
|---|---|---|
| GitHub stars | ★ 45K | ★ 8.3K |
| License | Custom / other | Apache-2.0 |
| Written in | Python | Java |
| Last push | 2026-09-20 | 2026-06-18 |
| Forks | ⑂ 4.9K | ⑂ 1.7K |
| 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 transmittable-thread-local if
- You want the transmittable-thread-local feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Java
- You evaluated both and transmittable-thread-local 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 transmittable-thread-local
TransmittableThreadLocal (TTL) is a small, zero dependency Java library from Alibaba that provides an enhanced InheritableThreadLocal capable of transmitting values between threads even when those threads are pooled and reused. It lives in the Java ecosystem and targets framework and middleware developers who need reliable context propagation across asynchronous execution boundaries. The library is Apache 2.0 licensed, roughly 1000 SLOC, and supports Java 6 through 21.
read the full transmittable-thread-local overview →
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Frequently asked questions
Is Sentry or transmittable-thread-local more popular?
Sentry has 44,806 GitHub stars and transmittable-thread-local has 8,308. Sentry has the larger community by that measure.
Are Sentry and transmittable-thread-local free?
Both are open source. Sentry has no licence declared in this registry, and transmittable-thread-local is licensed under Apache-2.0. Both are free to self-host.
What is the difference between Sentry and transmittable-thread-local?
Sentry is written in Python and transmittable-thread-local 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 transmittable-thread-local?
Choose Sentry if you want the larger community (44,806 stars) or its Custom / other licence terms. Choose transmittable-thread-local if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.