head to head · open source
fastapi vs swift-openapi-generator
fastapi has 102,409 GitHub stars, 9,906 forks, 78 open issues and last shipped 5 days ago. swift-openapi-generator has 1,971 stars, 182 forks, 132 open issues and last shipped 18 days ago. fastapi leads on adoption by 5,096% (102,409 vs 1,971 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 9%. 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 | ★ 102K | ★ 2.0K |
| License | MIT | Apache-2.0 |
| Written in | Python | Swift |
| Last push | 2026-09-14 | 2026-09-01 |
| Forks | ⑂ 9.9K | ⑂ 182 |
| 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 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 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 swift-openapi-generator
Swift OpenAPI Generator is an Apache 2.0 licensed Swift package plugin and command line tool from Apple that reads an OpenAPI document written in YAML or JSON and generates the type safe Swift client and server code needed to make HTTP calls or implement HTTP services, and it is aimed at Swift developers building API clients for Apple platforms and at server side Swift developers implementing HTTP APIs. It is an SSWG incubating project.
read the full swift-openapi-generator overview →
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Frequently asked questions
Is fastapi or swift-openapi-generator more popular?
fastapi has 102,409 GitHub stars and swift-openapi-generator has 1,971. 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 (102,409 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.