head to head · open source
fastapi vs kubb
fastapi has 102,409 GitHub stars, 9,906 forks, 78 open issues and last shipped 5 days ago. kubb has 1,802 stars, 147 forks, 6 open issues and last shipped yesterday. fastapi leads on adoption by 5,583% (102,409 vs 1,802 stars). fastapi is written in Python under MIT; kubb is written in TypeScript under MIT. fastapi has attracted 10% as many forks as stars, kubb 8%. kubb 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
| fastapi | kubb | |
|---|---|---|
| GitHub stars | ★ 102K | ★ 1.8K |
| License | MIT | MIT |
| Written in | Python | TypeScript |
| Last push | 2026-09-14 | 2026-09-18 |
| Forks | ⑂ 9.9K | ⑂ 147 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick fastapi if
- You weight community size — 102K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick kubb if
- You want the kubb feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches TypeScript
- You evaluated both and kubb fits your workflow better
About fastapi
FastAPI is an MIT licensed, high performance Python web framework for building APIs with standard Python type hints, aimed at Python developers and teams that need production ready HTTP services with automatic OpenAPI documentation.
read the full fastapi overview →
About kubb
Kubb is an MIT licensed TypeScript meta framework for code generation that turns an OpenAPI schema into type safe TypeScript types, HTTP clients, data fetching hooks, validators, and mocks for front end and full stack developers.
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Frequently asked questions
Is fastapi or kubb more popular?
fastapi has 102,409 GitHub stars and kubb has 1,802. fastapi has the larger community by that measure.
Are fastapi and kubb free?
Both are open source. fastapi is licensed under MIT and kubb under MIT. Neither carries a licence fee.
What is the difference between fastapi and kubb?
fastapi is written in Python and kubb 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, fastapi or kubb?
Choose fastapi if you want the larger community (102,409 stars) or its MIT licence terms. Choose kubb if its feature set, stack or MIT licence fits better. Both are self-hostable.