87.1k
Spec-kit
A toolkit designed to simplify and accelerate Spec-Driven Development, helping developers create, manage, and implement specifications efficiently.
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2 Open Source Alternatives to OpenAPI
There are 2 open-source alternatives to OpenAPI in this directory. The most popular is Spec-kit with 87.1k GitHub stars, followed by A2A(18.7k stars). All are open source, free to use, and many can be self-hosted.
Quick comparison
| # | Tool | Stars | Language | License |
|---|---|---|---|---|
| 1 | Spec-kit A toolkit designed to simplify and accelerate Spec-Driven Development, helping developers create, manage, and implement specifications efficiently. | 87.1k | Python | MIT License |
| 2 | A2A An open protocol facilitating seamless communication and interoperability between opaque and agentic applications. | 18.7k | TypeScript | Apache License 2.0 |
All open-source alternatives to OpenAPI
Frequently asked questions
What are the best open-source alternatives to OpenAPI?
The top three are Spec-kit(87.1k stars), A2A(18.7k stars). All are open source and free to use.
Are these alternatives to OpenAPI free?
Yes. Every tool listed here is open source and free to use in your own projects. Many can be self-hosted on your own infrastructure, which means no subscription fees and full control over your data.
Can I self-host an alternative to OpenAPI?
Many of the alternatives listed are self-hostable. Each tool's page lists hosting details, system requirements, and licensing terms.
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