head to head · open source
Uptime Kuma vs resilience4j
Uptime Kuma has 91,477 GitHub stars, 8,426 forks, 805 open issues and last shipped yesterday. resilience4j has 10,763 stars, 1,501 forks, 306 open issues and last shipped 18 days ago. Uptime Kuma leads on adoption by 750% (91,477 vs 10,763 stars). Uptime Kuma is written in JavaScript under MIT; resilience4j is written in Java under Apache-2.0. Uptime Kuma has attracted 9% as many forks as stars, resilience4j 14%. 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 | resilience4j | |
|---|---|---|
| GitHub stars | ★ 91K | ★ 11K |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Java |
| Last push | 2026-09-17 | 2026-08-31 |
| Forks | ⑂ 8.4K | ⑂ 1.5K |
| 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 resilience4j if
- You want the resilience4j 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 resilience4j 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 resilience4j
Resilience4j is a lightweight fault tolerance library for Java, designed around functional programming. It lives in the Java ecosystem and is distributed under the Apache 2.0 license. The library provides higher order functions, called decorators, that enhance any functional interface, lambda expression or method reference with a Circuit Breaker, Rate Limiter, Retry or Bulkhead. Version 3 of the library requires Java 21, while the project originated as a library for Java 8. The repository has been active for roughly eleven years and carries 10,760 stars, 1,499 forks and 306 open issues.
read the full resilience4j overview →
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Frequently asked questions
Is Uptime Kuma or resilience4j more popular?
Uptime Kuma has 91,477 GitHub stars and resilience4j has 10,763. Uptime Kuma has the larger community by that measure.
Are Uptime Kuma and resilience4j free?
Both are open source. Uptime Kuma is licensed under MIT and resilience4j under Apache-2.0. Neither carries a licence fee.
What is the difference between Uptime Kuma and resilience4j?
Uptime Kuma is written in JavaScript and resilience4j 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 resilience4j?
Choose Uptime Kuma if you want the larger community (91,477 stars) or its MIT licence terms. Choose resilience4j if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.