head to head · open source
one-api vs azure-rest-api-specs
one-api has 36,940 GitHub stars, 6,867 forks, 1,036 open issues and last shipped 8 months ago. azure-rest-api-specs has 3,093 stars, 5,958 forks, 3,379 open issues and last shipped today. one-api leads on adoption by 1,094% (36,940 vs 3,093 stars). one-api is written in JavaScript under MIT; azure-rest-api-specs is written in TypeSpec under MIT. one-api has attracted 19% as many forks as stars, azure-rest-api-specs 193%. azure-rest-api-specs 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 | azure-rest-api-specs | |
|---|---|---|
| GitHub stars | ★ 37K | ★ 3.1K |
| License | MIT | MIT |
| Written in | JavaScript | TypeSpec |
| Last push | 2026-01-09 | 2026-09-18 |
| Forks | ⑂ 6.9K | ⑂ 6.0K |
| 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 azure-rest-api-specs if
- You want the azure-rest-api-specs feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeSpec
- You evaluated both and azure-rest-api-specs 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 azure-rest-api-specs
Azure REST API Specifications Description This repository is the canonical source for REST API specifications for Microsoft Azure. You can learn more about it here. Getting started If you're a Microsoft employee looking for information about all of the repositories and steps for Azure SDK Libraries Releases, go to the aka.ms/azsdk/join. External Contributors can read Getting Started with OpenAPI Specifications and Getting Started with TypeSpec Specifications. Directory Structure See aka.ms/azsdk/spec dirs. Examples These examples provide a starting point for how a library should be structured, as well as the expe…
read the full azure-rest-api-specs overview →
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Frequently asked questions
Is one-api or azure-rest-api-specs more popular?
one-api has 36,940 GitHub stars and azure-rest-api-specs has 3,093. one-api has the larger community by that measure.
Are one-api and azure-rest-api-specs free?
Both are open source. one-api is licensed under MIT and azure-rest-api-specs under MIT. Neither carries a licence fee.
What is the difference between one-api and azure-rest-api-specs?
one-api is written in JavaScript and azure-rest-api-specs in TypeSpec. 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 azure-rest-api-specs?
Choose one-api if you want the larger community (36,940 stars) or its MIT licence terms. Choose azure-rest-api-specs if its feature set, stack or MIT licence fits better. Both are self-hostable.