FastAPI vs Flask
| FastAPI | Flask | |
|---|---|---|
| License | MIT | BSD-3-Clause |
| Latest version | 0.141.1 | 3.1.3 |
| GitHub stars | 101,322 | 72,119 |
| GitHub forks | 9,732 | 16,923 |
| Open issues | 74 | 7 |
| Releases (90d) | 25 | 0 |
| npm downloads (week) | — | — |
| PyPI downloads (week) | 147,137,983 | 48,033,510 |
Sources: official APIs (GitHub, npm, PyPI, crates.io). Capture dates shown on each tool page. Missing value = the source does not publish it ("—", never estimated).