head to head · open source
OpenObserve vs resilience4j
OpenObserve has 22,796 GitHub stars, 1,179 forks, 598 open issues and last shipped yesterday. resilience4j has 10,800 stars, 1,538 forks, 306 open issues and last shipped 6 days ago. OpenObserve leads on adoption by 111% (22,796 vs 10,800 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 | ★ 23K | ★ 11K |
| License | AGPL-3.0 | Apache-2.0 |
| Written in | TypeScript | Java |
| Last push | 2026-11-04 | 2026-10-30 |
| Forks | ⑂ 1.2K | ⑂ 1.5K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenObserve if
- You weight community size — 23K 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
Open source Datadog alternative for logs, metrics, traces, and frontend monitoring. Modern observability platform: 10x easier, 140x lower storage cost, high performance, petabyte scale. Cloud · Documentation · Slack · Quickstart OpenObserve (O2) is a cloud native observability platform for logs, metrics, traces, analytics, Real User Monitoring (RUM), and AI/LLM observability. It's a cost effective alternative to Datadog, Splunk, and Elasticsearch for teams that need full observability without the complexity or cost — with Parquet columnar storage and an S3 native design that cuts storage costs by up to 140x…
read the full OpenObserve overview →
About resilience4j
= Fault tolerance library designed for functional programming :author: Robert Winkler and Bohdan Storozhuk :icons: :toc: macro :numbered: 1 ifdef::env github[] :tip caption: :bulb: :note caption: :information source: :important caption: :heavy exclamation mark: :caution caption: :fire: :warning caption: :warning: endif::[] image: Status"] image: image: image: License 2", link=" image: link=" image: link=" image: link=" image: link=" image: link=" image: link=" image: toc::[] == Introduction Resilience4j is a lightweight fault tolerance library designed for functional programming. Resilience4j provides higher…
read the full resilience4j overview →
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Frequently asked questions
Is OpenObserve or resilience4j more popular?
OpenObserve has 22,796 GitHub stars and resilience4j has 10,800. 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 (22,796 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.