head to head · open source
OpenAPI-Specification vs typia
OpenAPI-Specification has 31,295 GitHub stars, 9,144 forks, 80 open issues and last shipped 2 days ago. typia has 5,960 stars, 233 forks, 4 open issues and last shipped 2 days ago. OpenAPI-Specification leads on adoption by 425% (31,295 vs 5,960 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%. OpenAPI-Specification 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 | ★ 6.0K |
| License | Apache-2.0 | MIT |
| Written in | Markdown | TypeScript |
| Last push | 2026-11-03 | 2026-11-03 |
| Forks | ⑂ 9.1K | ⑂ 233 |
| 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 The OpenAPI Specification is a community driven open specification within the OpenAPI Initiative, a Linux Foundation Collaborative Project. The OpenAPI Specification (OAS) defines a standard, programming language agnostic interface description for HTTP APIs. This allows both humans and computers to discover and understand the capabilities of a service without requiring access to source code, additional documentation, or inspection of network traffic. When properly defined via OpenAPI, a consumer can understand and interact with the remote service with a minimal amount of implementation…
read the full OpenAPI-Specification overview →
About typia
Typia typia is a transformer library supporting below features: Super fast Runtime Validators Enhanced JSON schema and serde functions LLM function calling harness Protocol Buffer encoder and decoder Random data generator [!NOTE] Only one line required, with pure TypeScript type Runtime validator is 20,000x faster than class validator JSON serialization is 200x faster than class transformer LLM function calling harness turns 6.75% → 100% accuracy Write the type on the left, and typia compiles it into the validator on the right — at build time, with no schema and no runtime reflection. Setup Install typia with…
read the full typia overview →
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Frequently asked questions
Is OpenAPI-Specification or typia more popular?
OpenAPI-Specification has 31,295 GitHub stars and typia has 5,960. 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 (31,295 stars) or its Apache-2.0 licence terms. Choose typia if its feature set, stack or MIT licence fits better. Both are self-hostable.