compare
mypy vs Pyrefly
The same facts for both, read from GitHub every night, and the relation a person reviewed.
| Fact | mypy | Pyrefly |
|---|---|---|
| Language | Python | Rust |
| Licence | Other | MIT |
| Stars | 21k | 7k |
| Latest | v2.4.0 | 1.3.2 |
| Last push | 2026-10-06 | 2026-10-06 |
| Release cadence | too few releases | too few releases |
| Active contributors | 28 commit authors on the default branch in the last 90 days | 39+ commit authors on the default branch in the last 90 days |
| Flags | none | none |
How they relate
Pyrefly replaces mypy. Alternatives to mypy →
Full replacementWritten in Rust, with a language server for editors.
mypy
This repository publishes tags, not GitHub releases.
Pyrefly
- 1.4.0-dev.32026-10-02Pyrefly v1.4.0-dev.3pre-release
- 1.4.0-dev.22026-09-28Pyrefly v1.4.0-dev.2pre-release
- 1.3.22026-09-28Pyrefly v1.3.2
- 1.4.0-dev.12026-09-19Pyrefly v1.4.0-dev.1pre-release
- 1.2.12026-09-18Pyrefly v1.2.1
mypy
unsigned The latest release, v2.4.0, carries no signature GitHub could verify.
Loading the security report
Pyrefly
unsigned The latest release, 1.3.2, carries no signature GitHub could verify.
Loading the security report