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 and an extension for popular IDEs and editors such as VSCode, Neovim, Zed, and more.
Publisher’s description
What is Pyrefly?
Pyrefly is an open-source languages & sdk program for Windows from Meta. It is written in Rust.
Installation and requirements
Official installers exist for 64-bit and ARM64 as Portable. It runs without installation (portable).
Updates and version history
The current version is 1.3.2, released on September 28, 2026. 3 versions are listed since June 19, 2026, each with links to its own installer files. The last update is less than a month old.
Popularity and file types
The source code on GitHub (facebook/pyrefly) has 7,123 stars. Similar programs include Go Programming Language, LLVM and Deno.
Project description on GitHub: “A fast type checker and language server for Python”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Native ARM64 build for Windows on Arm
- Portable: runs without installation
- Updated in the last two months
- Large user base
In short: Pyrefly is an open-source languages & sdk tool for 64-bit and ARM64 PCs.
Is Pyrefly safe to download?
- The file is served by github.com, the publisher’s own domain
- The download link uses HTTPS
- A SHA256 hash is published, so you can verify the file:
3F23B1807033AFF34C96F65EAD4958D1493FBCBB087CC5BA3AB3CE9EBBD95911· Open the VirusTotal report for this hash - The link has not been checked yet
- The source code is public
- ExeAtlas does not host, wrap or modify installers
Related guide: How to check a file’s SHA256 hash on Windows
Recent versions
All 3 versions ›| Version | Date | Size | Files |
|---|---|---|---|
| 1.3.2Latest | September 28, 2026 | — | ARM64 ZIP64-bit ZIP |
| 1.2.0 | August 1, 2026 | — | ARM64 ZIP64-bit ZIP |
| 1.1.1 | June 19, 2026 | — | 64-bit ZIPARM64 ZIP |
Install from the command line
Silent install ›winget install --id facebook.pyrefly -eRelated guide: How to use winget: install and update apps
Information
- Publisher
- Meta
- Category
- Languages & SDKs
- Licence
- MIT
- Price
- Free
- Source code
- github.com/facebook/pyrefly
- Written in
- Rust
- Requires
- Windows 11 / 10
- Architecture
- 64-bit, ARM64
- Installer
- Portable
- Version
- 1.3.2
- Released
- September 28, 2026
- Added to the catalogue
- July 7, 2026
- Versions listed
- 3
- GitHub stars
- 7,123
- GitHub forks
- 565
- Website
- github.com
- winget ID
- facebook.pyrefly
Ratings and reviews
No reviews yet. Be the first to rate it.
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Frequently asked questions
Is Pyrefly free?
Yes. Pyrefly is open-source software under the MIT licence.
Is Pyrefly safe to download?
The download comes from github.com, which belongs to the publisher; ExeAtlas does not host or change the file. Compare its SHA256 hash with the one shown here, or open the VirusTotal report for that hash.
How do I install Pyrefly with winget?
Open PowerShell or Windows Terminal and run the winget command shown on this page. winget downloads the official installer and checks its SHA256 hash before running it.
Does Pyrefly run on ARM (Windows on Arm)?
Yes, there is a native ARM64 installer.
Where can I download an older version of Pyrefly?
The versions page lists all 3 versions with links to their official installer files, back to June 19, 2026.
Can I use Pyrefly without administrator rights?
Yes, it is portable: unpack and run it.
What are alternatives to Pyrefly?
Go Programming Language, LLVM, Deno, CMake and Yarn. The alternatives page compares them.
