Bun is a JavaScript runtime, package manager and test runner designed as a drop-in replacement for Node.js. Bun uses Safari's JavaScriptCore as its JavaScript engine, unlike Node.js and Deno, which run on the V8 engine used by Chromium.
Bun was originally developed by Jarred Sumner, with its initial release in September 2021. It was acquired by Anthropic in December 2025.
Bun supports bundling, minifying and server-side rendering (Svelte, Nuxt.js, Vite). Bundling refers to the process of combining multiple files and assets like JavaScript, CSS, and HTML files into a smaller number of files, to reduce the number of server requests and enhance performance. Minifying is a technique of compressing files by removing unnecessary characters (like whitespace, comments, etc.) without affecting their functionality, further optimizing website load times. Bun provides an API to decide whether to preserve some readability by e.g. keeping whitespace.
What is Bun?
Bun is an open-source languages & sdk program for Windows from Oven-sh. It is written in Rust. Besides Windows, it is available for Linux and macOS.
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 1.4.4, released on October 22, 2026. 72 versions are listed since April 1, 2024, each with links to its own installer files. That is about 28 releases a year. The last update is less than a month old.
Popularity and file types
The source code on GitHub (oven-sh/bun) has 96,340 stars. Wikipedia has an article about it in 12 of our languages. Similar programs include Go Programming Language, Deno and LLVM.
Project description on GitHub: “Incredibly fast JavaScript runtime, bundler, test runner, and package manager – all in one”
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
- Frequent updates (about 28 a year)
- Also runs on Linux and macOS
- Large user base
In short: Bun is an open-source languages & sdk tool for 64-bit and ARM64 PCs. It is actively maintained.
Is Bun 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:
CD2C0FCCC78F3EDE1F50CA827A15F063EDA13D4D150A3D0674F4F6E323D864A5· 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 72 versions ›72 versions over 3 years · about 28 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 1.4.4Latest | October 22, 2026 | — | 64-bit ZIPARM64 ZIP |
| 1.4.3 | October 10, 2026 | — | 64-bit ZIPARM64 ZIP |
| 1.4.2 | September 5, 2026 | — | 64-bit ZIPARM64 ZIP |
| 1.4.1 | September 4, 2026 | — | 64-bit ZIPARM64 ZIP |
| 1.4.0 | August 20, 2026 | — | 64-bit ZIPARM64 ZIP |
| 1.3.14 | May 12, 2026 | — | ARM64 ZIP64-bit ZIP |
| 1.3.13 | April 19, 2026 | — | 64-bit ZIPARM64 ZIP |
| 1.3.12 | April 9, 2026 | — | ARM64 ZIP64-bit ZIP |
Release cycle and support
Version 1.4.4 belongs to the 1 release line, still supported, with no end date announced.
| Release line | Released | Support ends | Latest version | Status |
|---|---|---|---|---|
| 1 | September 7, 2023 | not announced | 1.4.4 | Supported |
Install from the command line
Silent install ›winget install --id Oven-sh.Bun -escoop install main/bunProgram files (.exe): bun.exe, bunx.exe
Related guide: How to use winget: install and update apps
Information
- Publisher
- Oven-sh
- Category
- Languages & SDKs
- Licence
- MIT
- Price
- Free
- Source code
- github.com/oven-sh/bun
- Written in
- Rust
- Requires
- Windows 11 / 10
- Architecture
- 64-bit, ARM64
- Installer
- Portable
- Other platforms
- Linux, macOS
- Version
- 1.4.4
- Released
- October 22, 2026
- Added to the catalogue
- April 1, 2024
- Versions listed
- 72
- Updates / year
- 28.2
- GitHub stars
- 96,340
- GitHub forks
- 5,133
- Website
- bun.sh
- winget ID
- Oven-sh.Bun
- Scoop package
- main/bun
Ratings and reviews
No reviews yet. Be the first to rate it.
Alternatives to Bun
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Frequently asked questions
Is Bun free?
Yes. Bun is open-source software under the MIT licence.
Is Bun 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 Bun 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 Bun run on ARM (Windows on Arm)?
Yes, there is a native ARM64 installer.
Where can I download an older version of Bun?
The versions page lists all 72 versions with links to their official installer files, back to April 1, 2024.
Can I use Bun without administrator rights?
Yes, it is portable: unpack and run it.
What are alternatives to Bun?
Go Programming Language, Deno, LLVM, Yarn and CMake. The alternatives page compares them.
