head to head · open source
fastapi vs WireMock.Net
fastapi has 102,402 GitHub stars, 9,903 forks, 78 open issues and last shipped 4 days ago. WireMock.Net has 1,680 stars, 240 forks, 21 open issues and last shipped 8 days ago. fastapi leads on adoption by 5,995% (102,402 vs 1,680 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.
← all 8884 open source comparisons
Side by side
| fastapi | WireMock.Net | |
|---|---|---|
| GitHub stars | ★ 102K | ★ 1.7K |
| License | MIT | Apache-2.0 |
| Written in | Python | C# |
| Last push | 2026-09-14 | 2026-09-10 |
| Forks | ⑂ 9.9K | ⑂ 240 |
| 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 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 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 WireMock.Net
WireMock.Net is an open source C .NET library and mock server for stubbing and mocking web HTTP responses. It lives in the .NET ecosystem and is a developer tool for API development and testing. The project is based on mock4net and mimics functionality from the original Java based WireMock, while providing extended and different functionality. Documentation is available at wiremock.org/dotnet.
read the full WireMock.Net overview →
More in Developer Tools
Related comparisons
More API Development & Testing projects
Compare either of these against the rest of the API Development & Testing field.
Frequently asked questions
Is fastapi or WireMock.Net more popular?
fastapi has 102,402 GitHub stars and WireMock.Net has 1,680. 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 (102,402 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.