head to head · open source
OpenAPI-Specification vs typia
OpenAPI-Specification has 31,225 GitHub stars, 9,155 forks, 80 open issues and last shipped 9 days ago. typia has 5,912 stars, 224 forks, 4 open issues and last shipped yesterday. OpenAPI-Specification leads on adoption by 428% (31,225 vs 5,912 stars). OpenAPI-Specification is written in Markdown under Apache-2.0; typia is written in TypeScript under MIT. OpenAPI-Specification has attracted 29% as many forks as stars, typia 4%. typia was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (openapi), 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
| OpenAPI-Specification | typia | |
|---|---|---|
| GitHub stars | ★ 31K | ★ 5.9K |
| License | Apache-2.0 | MIT |
| Written in | Markdown | TypeScript |
| Last push | 2026-09-11 | 2026-09-19 |
| Forks | ⑂ 9.2K | ⑂ 224 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick OpenAPI-Specification if
- You weight community size — 31K stars and counting
- You want the Apache-2.0 license terms
- Your stack matches Markdown
- You value the larger contributor base for long-term maintenance
pick typia if
- You want the typia feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and typia fits your workflow better
About OpenAPI-Specification
The OpenAPI Specification (OAS) is a community driven open specification hosted within the OpenAPI Initiative, a Linux Foundation Collaborative Project. It defines a standard, programming language agnostic interface description for HTTP APIs, represented in YAML or JSON. The specification lives in the HTTP API tooling ecosystem, alongside the tools, libraries, and implementations listed in the repository's implementations document. The project source is released under the Apache 2.0 license, and its GitHub repository has accumulated roughly 31,000 stars and 9,100 forks across 13 years of activity.…
read the full OpenAPI-Specification overview →
About typia
Typia is an MIT licensed TypeScript transformer library that compiles pure TypeScript types into super fast runtime validators and serializers, built for TypeScript and Node.js developers who want runtime type safety without writing or maintaining a separate schema.
read the full typia overview →
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Frequently asked questions
Is OpenAPI-Specification or typia more popular?
OpenAPI-Specification has 31,225 GitHub stars and typia has 5,912. OpenAPI-Specification has the larger community by that measure.
Are OpenAPI-Specification and typia free?
Both are open source. OpenAPI-Specification is licensed under Apache-2.0 and typia under MIT. Neither carries a licence fee.
What is the difference between OpenAPI-Specification and typia?
OpenAPI-Specification is written in Markdown and typia in TypeScript. The practical differences are community size, licence terms, language stack and release cadence — all compared in the table above.
Which should I choose, OpenAPI-Specification or typia?
Choose OpenAPI-Specification if you want the larger community (31,225 stars) or its Apache-2.0 licence terms. Choose typia if its feature set, stack or MIT licence fits better. Both are self-hostable.