head to head · open source
fastapi vs serenity-js
fastapi has 102,402 GitHub stars, 9,903 forks, 78 open issues and last shipped 4 days ago. serenity-js has 616 stars, 152 forks, 88 open issues and last shipped yesterday. fastapi leads on adoption by 16,524% (102,402 vs 616 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%. serenity-js 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 | ★ 102K | ★ 616 |
| License | MIT | Apache-2.0 |
| Written in | Python | TypeScript |
| Last push | 2026-09-14 | 2026-09-17 |
| Forks | ⑂ 9.9K | ⑂ 152 |
| 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 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 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 serenity-js
Serenity/JS is a TypeScript native acceptance testing framework that gives an existing Playwright Test, WebdriverIO, or Cucumber suite the Screenplay Pattern's architecture, and it is built for test automation teams whose end to end and API suites have outgrown duplicated selectors, unreadable reports, and tool lock in.
read the full serenity-js overview →
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Frequently asked questions
Is fastapi or serenity-js more popular?
fastapi has 102,402 GitHub stars and serenity-js has 616. 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 (102,402 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.