head to head · open source
fastapi vs swift-openapi-generator
fastapi has 104,542 GitHub stars, 10,173 forks, 78 open issues and last shipped 2 days ago. swift-openapi-generator has 1,994 stars, 195 forks, 132 open issues and last shipped 8 days ago. fastapi leads on adoption by 5,143% (104,542 vs 1,994 stars). fastapi is written in Python under MIT; swift-openapi-generator is written in Swift under Apache-2.0. fastapi has attracted 10% as many forks as stars, swift-openapi-generator 10%. fastapi 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 | swift-openapi-generator | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 2.0K |
| License | MIT | Apache-2.0 |
| Written in | Python | Swift |
| Last push | 2026-11-01 | 2026-10-26 |
| Forks | ⑂ 10K | ⑂ 195 |
| Self-hosting | Yes | Yes |
| Data ownership | Your server | Your server |
pick fastapi if
- You weight community size — 105K stars and counting
- You want the MIT license terms
- Your stack matches Python
- You value the larger contributor base for long-term maintenance
pick swift-openapi-generator if
- You want the swift-openapi-generator feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Swift
- You evaluated both and swift-openapi-generator fits your workflow better
About fastapi
FastAPI framework, high performance, easy to learn, fast to code, ready for production Documentation : Source Code : FastAPI is a modern, fast (high performance), web framework for building APIs with Python based on standard Python type hints. The key features are: Fast : Very high performance, on par with NodeJS and Go (thanks to Starlette and Pydantic). One of the fastest Python frameworks available. Fast to code : Increase the speed to develop features by about 200% to 300%. Fewer bugs : Reduce about 40% of human (developer) induced errors. Intuitive : Great editor support. Completion everywhere. Less time…
read the full fastapi overview →
About swift-openapi-generator
Swift OpenAPI Generator Generate Swift client and server code from an OpenAPI document. Overview [OpenAPI][openapi] is a specification for documenting HTTP services. An OpenAPI document is written in either YAML or JSON, and can be read by tools to help automate workflows, such as generating the necessary code to send and receive HTTP requests. Swift OpenAPI Generator is a Swift package plugin that can generate the ceremony code required to make API calls, or implement API servers. The code is generated at build time, so it's always in sync with the OpenAPI document and doesn't need to be committed to your…
read the full swift-openapi-generator overview →
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Frequently asked questions
Is fastapi or swift-openapi-generator more popular?
fastapi has 104,542 GitHub stars and swift-openapi-generator has 1,994. fastapi has the larger community by that measure.
Are fastapi and swift-openapi-generator free?
Both are open source. fastapi is licensed under MIT and swift-openapi-generator under Apache-2.0. Neither carries a licence fee.
What is the difference between fastapi and swift-openapi-generator?
fastapi is written in Python and swift-openapi-generator in Swift. 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 swift-openapi-generator?
Choose fastapi if you want the larger community (104,542 stars) or its MIT licence terms. Choose swift-openapi-generator if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.