FastAPI vs Flask
pypiFastAPI: FastAPI framework, high performance, easy to learn, fast to code, ready for production
Flask: A simple framework for building complex web applications.
Updated
Side-by-side comparison
| Metric | FastAPI | Flask |
|---|---|---|
| Version | 0.135.1 | 3.1.3 |
| License | MIT | BSD-3-Clause |
| Weekly Downloads | 85.0M ▲ | 49.9M |
| Dependencies | 31 | 9 ▲ |
| Required Runtime | >=3.10 | >=3.9 |
| Deprecated | false | false |
Weekly downloads over time
FastAPI
Flask
Release activity
FastAPI
7 releases tracked
Averages one every 1 day
Last release: 34 days ago
Flask
1 release tracked
Last release: 41 days ago
Frequently asked questions
Which has more downloads, FastAPI or Flask?
FastAPI has 85.0M weekly downloads compared to Flask's 49.9M. FastAPI currently has more weekly downloads.
What license does FastAPI use vs Flask?
FastAPI uses the MIT license and Flask uses BSD-3-Clause. They use different licenses.
Which has fewer dependencies, FastAPI or Flask?
FastAPI has 31 dependencies and Flask has 9. Flask is lighter in terms of dependency count.