pyrefly
A fast type checker and language server for Python with powerful IDE features
Why this rank:Release freshnessHealthy release cadence
Description
# Pyrefly Pyrefly is a type checker and language server for Python, which provides lightning-fast type checking along with IDE features such as code navigation, semantic highlighting, and code completion. It is available as a [command-line tool](https://pyrefly.org/en/docs/installation/) and a [VSCode extension](https://marketplace.visualstudio.com/items?itemName=meta.pyrefly). See the [Pyrefly website](https://pyrefly.org) for full documentation and how to add Pyrefly to your editor of choice. Currently under active development with known issues. Please [open an issue](https://github.com/facebook/pyrefly/issues/new/choose) if you find bugs.
Release History
| Version | Changes | Urgency | Date |
|---|---|---|---|
| 0.62.0 | Imported from PyPI (0.62.0) | Low | 4/21/2026 |
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