head to head · open source
fastapi vs dev-proxy
fastapi has 102,402 GitHub stars, 9,903 forks, 78 open issues and last shipped 4 days ago. dev-proxy has 831 stars, 89 forks, 36 open issues and last shipped yesterday. fastapi leads on adoption by 12,223% (102,402 vs 831 stars). fastapi is written in Python under MIT; dev-proxy is written in C# under MIT. fastapi has attracted 10% as many forks as stars, dev-proxy 11%. dev-proxy 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 | dev-proxy | |
|---|---|---|
| GitHub stars | ★ 102K | ★ 831 |
| License | MIT | MIT |
| Written in | Python | C# |
| Last push | 2026-09-14 | 2026-09-17 |
| Forks | ⑂ 9.9K | ⑂ 89 |
| 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 dev-proxy if
- You want the dev-proxy feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C#
- You evaluated both and dev-proxy 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 dev-proxy
Dev Proxy is an open source, command line API simulator maintained under the .NET Foundation and written in C . It intercepts network requests, which means it works with any type of application and any technology stack rather than being tied to one language or framework. It is free to use and licensed under MIT, with the source living in the developer tools and API testing corner of the .NET ecosystem.
read the full dev-proxy overview →
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Frequently asked questions
Is fastapi or dev-proxy more popular?
fastapi has 102,402 GitHub stars and dev-proxy has 831. fastapi has the larger community by that measure.
Are fastapi and dev-proxy free?
Both are open source. fastapi is licensed under MIT and dev-proxy under MIT. Neither carries a licence fee.
What is the difference between fastapi and dev-proxy?
fastapi is written in Python and dev-proxy in C#. 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 dev-proxy?
Choose fastapi if you want the larger community (102,402 stars) or its MIT licence terms. Choose dev-proxy if its feature set, stack or MIT licence fits better. Both are self-hostable.