head to head · open source
fastapi vs WireMock.Net
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. WireMock.Net has 1,682 stars, 239 forks, 21 open issues and last shipped 2 days ago. fastapi leads on adoption by 6,117% (104,566 vs 1,682 stars). fastapi is written in Python under MIT; WireMock.Net is written in C# under Apache-2.0. fastapi has attracted 10% as many forks as stars, WireMock.Net 14%. 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 | WireMock.Net | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 1.7K |
| License | MIT | Apache-2.0 |
| Written in | Python | C# |
| Last push | 2026-11-02 | 2026-11-01 |
| Forks | ⑂ 10K | ⑂ 239 |
| 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 WireMock.Net if
- You want the WireMock.Net feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches C#
- You evaluated both and WireMock.Net 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 WireMock.Net
WireMock.Net A C .NET version based on mock4net which mimics functionality from the original Java based WireMock. :books: Full documentation can now be found at wiremock.org :star: Key Features HTTP response stubbing, matchable on URL/Path, headers, cookies and body content patterns Library can be used in unit tests and integration tests Runs as a standalone process, as windows service, as Azure/IIS or as docker Configurable via a fluent C .NET API, JSON files and JSON over HTTP Record/playback of stubs (proxying) Per request conditional proxying Stateful behaviour simulation Response templating / transformation…
read the full WireMock.Net overview →
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Frequently asked questions
Is fastapi or WireMock.Net more popular?
fastapi has 104,566 GitHub stars and WireMock.Net has 1,682. fastapi has the larger community by that measure.
Are fastapi and WireMock.Net free?
Both are open source. fastapi is licensed under MIT and WireMock.Net under Apache-2.0. Neither carries a licence fee.
What is the difference between fastapi and WireMock.Net?
fastapi is written in Python and WireMock.Net 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 WireMock.Net?
Choose fastapi if you want the larger community (104,566 stars) or its MIT licence terms. Choose WireMock.Net if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.