head to head · open source
Vector vs openmessaging-java
Vector has 22,589 GitHub stars, 2,286 forks, 2,512 open issues and last shipped 2 days ago. openmessaging-java has 723 stars, 219 forks, 13 open issues and last shipped 8 months ago. Vector leads on adoption by 3,024% (22,589 vs 723 stars). Vector is written in Rust under MPL-2.0; openmessaging-java is written in Java under Apache-2.0. Vector has attracted 10% as many forks as stars, openmessaging-java 30%. 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 | openmessaging-java | |
|---|---|---|
| GitHub stars | ★ 23K | ★ 723 |
| License | MPL-2.0 | Apache-2.0 |
| Written in | Rust | Java |
| Last push | 2026-09-18 | 2026-01-26 |
| Forks | ⑂ 2.3K | ⑂ 219 |
| 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 openmessaging-java if
- You want the openmessaging-java 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 openmessaging-java 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 openmessaging-java
OpenMessaging for Java is the vendor neutral Java runtime interface for distributed messaging and streaming, published as the io.openmessaging:openmessaging api artifact on Maven Central, and it is aimed at developers and platform teams who need messaging applications to run across heterogeneous brokers and operating systems instead of one vendor's proprietary client API.
read the full openmessaging-java overview →
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Frequently asked questions
Is Vector or openmessaging-java more popular?
Vector has 22,589 GitHub stars and openmessaging-java has 723. Vector has the larger community by that measure.
Are Vector and openmessaging-java free?
Both are open source. Vector is licensed under MPL-2.0 and openmessaging-java under Apache-2.0. Neither carries a licence fee.
What is the difference between Vector and openmessaging-java?
Vector is written in Rust and openmessaging-java 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 openmessaging-java?
Choose Vector if you want the larger community (22,589 stars) or its MPL-2.0 licence terms. Choose openmessaging-java if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.