head to head · open source
fastapi vs wiremock
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. wiremock has 7,415 stars, 1,533 forks, 503 open issues and last shipped yesterday. fastapi leads on adoption by 1,310% (104,566 vs 7,415 stars). fastapi is written in Python under MIT; wiremock is written in Java under Apache-2.0. fastapi has attracted 10% as many forks as stars, wiremock 21%. fastapi was the more recently maintained of the two, and both are self-hostable with no licence fee. The two share 1 topic tag (json), 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 | wiremock | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 7.4K |
| License | MIT | Apache-2.0 |
| Written in | Python | Java |
| Last push | 2026-11-02 | 2026-11-02 |
| Forks | ⑂ 10K | ⑂ 1.5K |
| 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 if
- You want the wiremock feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches Java
- You evaluated both and wiremock 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
WireMock flexible, open source API mocking WireMock open source is supported by WireMock Cloud . Please consider trying it out if your team needs advanced capabilities such as OpenAPI, dynamic state, data sources and more. WireMock is the popular open source tool for API mocking, with over 6 million downloads per month, and powers WireMock Cloud. It can help you to create stable test and development environments, isolate yourself from flaky 3rd parties and simulate APIs that don’t exist yet. Started in 2011 as a Java library by Tom Akehurst, now WireMock spans across multiple programming languages and technology…
read the full wiremock overview →
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Frequently asked questions
Is fastapi or wiremock more popular?
fastapi has 104,566 GitHub stars and wiremock has 7,415. fastapi has the larger community by that measure.
Are fastapi and wiremock free?
Both are open source. fastapi is licensed under MIT and wiremock under Apache-2.0. Neither carries a licence fee.
What is the difference between fastapi and wiremock?
fastapi is written in Python and wiremock in Java. 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?
Choose fastapi if you want the larger community (104,566 stars) or its MIT licence terms. Choose wiremock if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.