head to head · open source
OpenObserve vs resilience4j
OpenObserve has 22,027 GitHub stars, 1,098 forks, 598 open issues and last shipped today. resilience4j has 10,765 stars, 1,502 forks, 306 open issues and last shipped 20 days ago. OpenObserve leads on adoption by 105% (22,027 vs 10,765 stars). OpenObserve is written in TypeScript under AGPL-3.0; resilience4j is written in Java under Apache-2.0. OpenObserve has attracted 5% as many forks as stars, resilience4j 14%. OpenObserve was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (metrics), 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
| OpenObserve | resilience4j | |
|---|---|---|
| GitHub stars | ★ 22K | ★ 11K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | TypeScript | Java |
| Last push | 2026-09-20 | 2026-08-31 |
| Forks | ⑂ 1.1K | ⑂ 1.5K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenObserve if
- You weight community size — 22K stars and counting
- You want the AGPL-3.0 license terms
- Your stack matches TypeScript
- 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 OpenObserve
OpenObserve is an open source observability platform for logs, metrics, traces, analytics, Real User Monitoring, session replay, pipelines, SLO, and LLM observability. It lives in the cloud native infrastructure ecosystem and is described as an alternative to Datadog, Splunk, and Elasticsearch. The project is built in Rust, ships as a single binary, and uses Parquet columnar storage with an S3 native design.
read the full OpenObserve 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 OpenObserve or resilience4j more popular?
OpenObserve has 22,027 GitHub stars and resilience4j has 10,765. OpenObserve has the larger community by that measure.
Are OpenObserve and resilience4j free?
Both are open source. OpenObserve is licensed under AGPL-3.0 and resilience4j under Apache-2.0. Neither carries a licence fee.
What is the difference between OpenObserve and resilience4j?
OpenObserve is written in TypeScript 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, OpenObserve or resilience4j?
Choose OpenObserve if you want the larger community (22,027 stars) or its AGPL-3.0 licence terms. Choose resilience4j if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.