head to head · open source
fastapi vs Ocelot
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. Ocelot has 8,718 stars, 1,680 forks, 57 open issues and last shipped 3 days ago. fastapi leads on adoption by 1,099% (104,566 vs 8,718 stars). fastapi is written in Python under MIT; Ocelot is written in C# under MIT. fastapi has attracted 10% as many forks as stars, Ocelot 19%. fastapi was the more recently maintained of the two, and both are self-hostable with no licence fee.
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 | Ocelot | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 8.7K |
| License | MIT | MIT |
| Written in | Python | C# |
| Last push | 2026-11-02 | 2026-10-31 |
| Forks | ⑂ 10K | ⑂ 1.7K |
| 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 Ocelot if
- You want the Ocelot feature set and don't need the biggest community
- You prefer the MIT license terms
- Your stack matches C#
- You evaluated both and Ocelot 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 Ocelot
[ docspassing]: [ docsfailing]: About Ocelot is a .NET API gateway. This project is aimed at people using .NET running a microservices (service oriented) architecture that needs a unified point of entry into their system. However, it will work with anything that speaks HTTP(S) and runs on any platform that ASP.NET Core supports. Ocelot consists of a series of ASP.NET Core middlewares arranged in a specific order. Ocelot custom middlewares manipulate the HttpRequest object into a state specified by its configuration until it reaches a request builder middleware, where it creates a HttpRequestMessage object, which…
read the full Ocelot overview →
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Frequently asked questions
Is fastapi or Ocelot more popular?
fastapi has 104,566 GitHub stars and Ocelot has 8,718. fastapi has the larger community by that measure.
Are fastapi and Ocelot free?
Both are open source. fastapi is licensed under MIT and Ocelot under MIT. Neither carries a licence fee.
What is the difference between fastapi and Ocelot?
fastapi is written in Python and Ocelot 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 Ocelot?
Choose fastapi if you want the larger community (104,566 stars) or its MIT licence terms. Choose Ocelot if its feature set, stack or MIT licence fits better. Both are self-hostable.