head to head · open source
fastapi vs serenity-js
fastapi has 104,566 GitHub stars, 10,179 forks, 78 open issues and last shipped yesterday. serenity-js has 621 stars, 153 forks, 88 open issues and last shipped 4 days ago. fastapi leads on adoption by 16,738% (104,566 vs 621 stars). fastapi is written in Python under MIT; serenity-js is written in TypeScript under Apache-2.0. fastapi has attracted 10% as many forks as stars, serenity-js 25%. 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 | serenity-js | |
|---|---|---|
| GitHub stars | ★ 105K | ★ 621 |
| License | MIT | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-11-02 | 2026-10-30 |
| Forks | ⑂ 10K | ⑂ 153 |
| 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 serenity-js if
- You want the serenity-js feature set and don't need the biggest community
- You prefer the Apache-2.0 license terms
- Your stack matches TypeScript
- You evaluated both and serenity-js 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 serenity-js
Serenity/JS A TypeScript native test automation framework that gives your Playwright Test, WebdriverIO, or Cucumber test suite the architecture it needs to scale. Website · Getting Started · Handbook · API Docs · Community What a Serenity/JS test looks like Tests read like specifications. Each Task ( Authenticate , Inventory , Checkout ) is reusable across scenarios, test runners, and integration tools. See the full implementation → Note: The username and password above are public demo values from saucedemo.com. In real projects, use environment variables or a secrets manager. Why Serenity/JS? → See the same…
read the full serenity-js overview →
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Frequently asked questions
Is fastapi or serenity-js more popular?
fastapi has 104,566 GitHub stars and serenity-js has 621. fastapi has the larger community by that measure.
Are fastapi and serenity-js free?
Both are open source. fastapi is licensed under MIT and serenity-js under Apache-2.0. Neither carries a licence fee.
What is the difference between fastapi and serenity-js?
fastapi is written in Python and serenity-js in TypeScript. 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 serenity-js?
Choose fastapi if you want the larger community (104,566 stars) or its MIT licence terms. Choose serenity-js if its feature set, stack or Apache-2.0 licence fits better. Both are self-hostable.