head to head · open source
one-api vs chapar
one-api has 36,940 GitHub stars, 6,867 forks, 1,036 open issues and last shipped 8 months ago. chapar has 712 stars, 44 forks, 10 open issues and last shipped yesterday. one-api leads on adoption by 5,088% (36,940 vs 712 stars). one-api is written in JavaScript under MIT; chapar is written in Go under BSD-3-Clause. one-api has attracted 19% as many forks as stars, chapar 6%. chapar 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 | chapar | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 712 |
| License | MIT | BSD-3-Clause |
| Written in | JavaScript | Go |
| Last push | 2026-01-09 | 2026-09-17 |
| Forks | ⑂ 6.9K | ⑂ 44 |
| 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 chapar if
- You want the chapar feature set and don't need the biggest community
- You prefer the BSD-3-Clause license terms
- Your stack matches Go
- You evaluated both and chapar 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 chapar
Chapar Native API Testing Tool Chapar is an upcoming native API testing tool built with GoLang, designed to simplify and expedite the testing process for developers. While still in its early beta phase, Chapar aims to offer a user friendly experience with support for both HTTP and gRPC protocols with. What Chapar means? Chapar was the institution of the royal mounted couriers in ancient Persia. The messengers, called Chapar, alternated in stations a day's ride apart along the Royal Road. The riders were exclusively in the service of the Great King and the network allowed for messages to be transported from Susa t…
read the full chapar overview →
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Frequently asked questions
Is one-api or chapar more popular?
one-api has 36,940 GitHub stars and chapar has 712. one-api has the larger community by that measure.
Are one-api and chapar free?
Both are open source. one-api is licensed under MIT and chapar under BSD-3-Clause. Neither carries a licence fee.
What is the difference between one-api and chapar?
one-api is written in JavaScript and chapar in Go. 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 chapar?
Choose one-api if you want the larger community (36,940 stars) or its MIT licence terms. Choose chapar if its feature set, stack or BSD-3-Clause licence fits better. Both are self-hostable.