head to head · open source
Uptime Kuma vs transmittable-thread-local
Uptime Kuma has 91,477 GitHub stars, 8,426 forks, 805 open issues and last shipped yesterday. transmittable-thread-local has 8,306 stars, 1,722 forks, 57 open issues and last shipped 3 months ago. Uptime Kuma leads on adoption by 1,001% (91,477 vs 8,306 stars). Uptime Kuma is written in JavaScript under MIT; transmittable-thread-local is written in Java under Apache-2.0. Uptime Kuma has attracted 9% as many forks as stars, transmittable-thread-local 21%. Uptime Kuma 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
| Uptime Kuma | transmittable-thread-local | |
|---|---|---|
| GitHub stars | ★ 91K | ★ 8.3K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Java |
| Last push | 2026-09-17 | 2026-06-18 |
| Forks | ⑂ 8.4K | ⑂ 1.7K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Uptime Kuma if
- You weight community size — 91K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- 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 Uptime Kuma
Uptime Kuma is a free, MIT licensed, self hosted monitoring tool with a reactive web dashboard, built for operators and teams that want to watch their own HTTP, TCP, and DNS endpoints and keep the resulting data on their own infrastructure.
read the full Uptime Kuma 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 Uptime Kuma or transmittable-thread-local more popular?
Uptime Kuma has 91,477 GitHub stars and transmittable-thread-local has 8,306. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and transmittable-thread-local free?
Both are open source. Uptime Kuma is licensed under MIT and transmittable-thread-local under Apache-2.0. Neither carries a licence fee.
What is the difference between Uptime Kuma and transmittable-thread-local?
Uptime Kuma is written in JavaScript 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, Uptime Kuma or transmittable-thread-local?
Choose Uptime Kuma if you want the larger community (91,477 stars) or its MIT licence terms. Choose transmittable-thread-local if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.