head to head · open source
one-api vs arex-agent-java
one-api has 36,940 GitHub stars, 6,867 forks, 1,036 open issues and last shipped 8 months ago. arex-agent-java has 565 stars, 141 forks, 74 open issues and last shipped 16 days ago. one-api leads on adoption by 6,438% (36,940 vs 565 stars). one-api is written in JavaScript under MIT; arex-agent-java is written in Java under Apache-2.0. one-api has attracted 19% as many forks as stars, arex-agent-java 25%. arex-agent-java 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
| one-api | arex-agent-java | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 565 |
| License | MIT | Apache-2.0 |
| Written in | JavaScript | Java |
| Last push | 2026-01-09 | 2026-09-02 |
| Forks | ⑂ 6.9K | ⑂ 141 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick one-api if
- You weight community size — 37K stars and counting
- You want the MIT license terms
- Your stack matches JavaScript
- You value the larger contributor base for long-term maintenance
pick arex-agent-java if
- You want the arex-agent-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 arex-agent-java fits your workflow better
About one-api
One API is a self hosted LLM API management and key redistribution system that exposes many model providers through the standard OpenAI API format, aimed at developers, teams and operators who want a single endpoint, a single key model and a single quota surface across providers.
read the full one-api overview →
About arex-agent-java
AREX An Open Source Testing Framework with Real World Data Introduction Building Getting Started Contributing License Introduction As your application evolves more complex, the effort required to thoroughly test against it also becomes tremendous. Arex is a framework designed around a quite straightforward principle of leveraging your real world data(i.e. database record, service payload, cache items etc.) for regression testing. Simple is powerful. The idea behind makes it incredibly powerful. AREX provides an out of box agent file that could be attached to any applications with Java 8+ and dynamically weaves so…
read the full arex-agent-java overview →
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Frequently asked questions
Is one-api or arex-agent-java more popular?
one-api has 36,940 GitHub stars and arex-agent-java has 565. one-api has the larger community by that measure.
Are one-api and arex-agent-java free?
Both are open source. one-api is licensed under MIT and arex-agent-java under Apache-2.0. Neither carries a licence fee.
What is the difference between one-api and arex-agent-java?
one-api is written in JavaScript and arex-agent-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, one-api or arex-agent-java?
Choose one-api if you want the larger community (36,940 stars) or its MIT licence terms. Choose arex-agent-java if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.