head to head · open source
one-api vs ATAC
one-api has 36,932 GitHub stars, 6,867 forks, 1,036 open issues and last shipped 8 months ago. ATAC has 3,729 stars, 137 forks, 20 open issues and last shipped 15 days ago. one-api leads on adoption by 890% (36,932 vs 3,729 stars). one-api is written in JavaScript under MIT; ATAC is written in Rust under MIT. one-api has attracted 19% as many forks as stars, ATAC 4%. ATAC was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (api), 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
| one-api | ATAC | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 3.7K |
| License | MIT | MIT |
| Written in | JavaScript | Rust |
| Last push | 2026-01-09 | 2026-09-03 |
| Forks | ⑂ 6.9K | ⑂ 137 |
| 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 ATAC if
- You want the ATAC feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches Rust
- You evaluated both and ATAC 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 ATAC
ATAC is a terminal API client written in Rust and licensed under MIT. It lives in the developer tools and API development and testing ecosystem, and it targets users who want a Postman like workflow without leaving a terminal. The project describes itself as Arguably a Terminal API Client, and it is based on clients such as Postman, Insomnia, and Bruno.
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Frequently asked questions
Is one-api or ATAC more popular?
one-api has 36,932 GitHub stars and ATAC has 3,729. one-api has the larger community by that measure.
Are one-api and ATAC free?
Both are open source. one-api is licensed under MIT and ATAC under MIT. Neither carries a licence fee.
What is the difference between one-api and ATAC?
one-api is written in JavaScript and ATAC in Rust. 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 ATAC?
Choose one-api if you want the larger community (36,932 stars) or its MIT licence terms. Choose ATAC if its feature set, stack or MIT licence fits better. Both are self-hostable.