head to head · open source
fastapi vs WebApiClient
fastapi has 104,542 GitHub stars, 10,173 forks, 78 open issues and last shipped 2 days ago. WebApiClient has 2,136 stars, 445 forks, 14 open issues and last shipped 4 months ago. fastapi leads on adoption by 4,794% (104,542 vs 2,136 stars). fastapi is written in Python under MIT; WebApiClient is written in C# under MIT. fastapi has attracted 10% as many forks as stars, WebApiClient 21%. fastapi was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 2 topic tags (json, 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 | WebApiClient | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 2.1K |
| License | MIT | MIT |
| Written in | Python | C# |
| Last push | 2026-11-01 | 2026-07-17 |
| Forks | ⑂ 10K | ⑂ 445 |
| 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 WebApiClient if
- You want the WebApiClient feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C#
- You evaluated both and WebApiClient 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 WebApiClient
README 中文文档 WebApiClient A REST API library with better functionality, performance, and scalability than refit. Features Semantic Declaration Client development only requires semantic declaration of C interfaces. Diverse serialization Supports json, xml, form and other custom serialization methods. Full trimmed and AOT Supports full trimmed and AOT publishing of .NET8. Aspect Oriented Programming Supports multiple interceptors, filters, logs, retries, custom caches and other aspects. Code Syntax Analysis Provides syntax analysis and prompts for interface code declarations to help developers avoid using improper…
read the full WebApiClient overview →
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Frequently asked questions
Is fastapi or WebApiClient more popular?
fastapi has 104,542 GitHub stars and WebApiClient has 2,136. fastapi has the larger community by that measure.
Are fastapi and WebApiClient free?
Both are open source. fastapi is licensed under MIT and WebApiClient under MIT. Neither carries a licence fee.
What is the difference between fastapi and WebApiClient?
fastapi is written in Python and WebApiClient 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 WebApiClient?
Choose fastapi if you want the larger community (104,542 stars) or its MIT licence terms. Choose WebApiClient if its feature set, stack or MIT licence fits better. Both are self-hostable.