head to head · open source
Vector vs resilience4j
Vector has 22,589 GitHub stars, 2,286 forks, 2,512 open issues and last shipped 2 days ago. resilience4j has 10,765 stars, 1,502 forks, 306 open issues and last shipped 20 days ago. Vector leads on adoption by 110% (22,589 vs 10,765 stars). Vector is written in Rust under MPL-2.0; resilience4j is written in Java under Apache-2.0. Vector has attracted 10% as many forks as stars, resilience4j 14%. Vector 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
| Vector | resilience4j | |
|---|---|---|
| GitHub stars | ★ 23K | ★ 11K |
| License | MPL-2.0 | Apache-2.0 |
| Written in | Rust | Java |
| Last push | 2026-09-18 | 2026-08-31 |
| Forks | ⑂ 2.3K | ⑂ 1.5K |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick Vector if
- You weight community size — 23K stars and counting
- You want the MPL-2.0 license terms
- Your stack matches Rust
- 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 Vector
Vector is an open source observability data pipeline written in Rust and licensed under MPL 2.0. It operates as an end to end system for collecting, transforming, and routing logs and metrics within the cloud native monitoring ecosystem. The project is maintained by Datadog's Community Open Source Engineering team, and its topics include agent, cloud native, data transformation, datadog, etl, events, forwarder, logs, metrics, and monitoring.
read the full Vector 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 Vector or resilience4j more popular?
Vector has 22,589 GitHub stars and resilience4j has 10,765. Vector has the larger community by that measure.
Are Vector and resilience4j free?
Both are open source. Vector is licensed under MPL-2.0 and resilience4j under Apache-2.0. Neither carries a licence fee.
What is the difference between Vector and resilience4j?
Vector is written in Rust 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, Vector or resilience4j?
Choose Vector if you want the larger community (22,589 stars) or its MPL-2.0 licence terms. Choose resilience4j if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.