Wasmtime is a Bytecode Alliance project that is a standalone wasm-only optimizing runtime for WebAssembly and WASI. It runs WebAssembly code outside of the Web, and can be used both as a command-line utility or as a library embedded in a larger application.
Publisher’s description
What is Wasmtime?
Wasmtime by Bytecode Alliance is open-source Windows software in the languages & sdks category. It is written in Rust.
Installation and requirements
The publisher provides Portable installers for 64-bit Windows. It runs without installation (portable).
Updates and version history
The current version is 50.0.0, released on October 20, 2026. The version history goes back to June 8, 2023: 70 releases, all linked to the official files. That is about 21 releases a year. The last update is less than a month old.
Popularity and file types
The source code on GitHub (bytecodealliance/wasmtime) has 18,746 stars. On Windows it registers 1 file type, including .wasm. Similar programs include Go Programming Language, LLVM and Deno.
Project description on GitHub: “A lightweight WebAssembly runtime that is fast, secure, and standards-compliant”
Pros / Cons
Pros
- Open source: the code can be inspected and built by anyone
- Portable: runs without installation
- Frequent updates (about 21 a year)
- Large user base
Cons
- No native ARM64 build
In short: Wasmtime is an open-source languages & sdk tool for 64-bit PCs. It is actively maintained.
Is Wasmtime 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:
CEA9CCC700AACCB2B5507E96AC990BA60104BD7AB39284FB2E67CB64D58EFCC4· 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
Security practices (OpenSSF Scorecard)
Automated checks of the bytecodealliance/wasmtime repository on GitHub by the Open Source Security Foundation, last run on October 19, 2026.
- Actively maintained10
- Security policy10
- Code review10
- No dangerous workflows10
- No binaries in the repository10
- Licence declared10
- Fuzzing10
- Published packages10
- Branch protection4
- Restricted token permissions0
- OpenSSF Best Practices badge0
- Signed releases0
- Static code analysis0
- Pinned dependencies0
The score rates how the project is developed and released, not whether the program is safe to install. scorecard.dev
Recent versions
All 70 versions ›70 versions over 3 years · about 21 a year
| Version | Date | Size | Files |
|---|---|---|---|
| 50.0.0Latest | October 20, 2026 | — | 64-bit ZIP |
| 49.0.4 | October 19, 2026 | — | 64-bit ZIP |
| 49.0.3 | October 14, 2026 | — | 64-bit ZIP |
| 49.0.2 | October 2, 2026 | — | 64-bit ZIP |
| 49.0.1 | September 24, 2026 | — | 64-bit ZIP |
| 49.0.0 | September 21, 2026 | — | 64-bit ZIP |
| 48.0.2 | September 10, 2026 | — | 64-bit ZIP |
| 48.0.1 | August 24, 2026 | — | 64-bit ZIP |
Install from the command line
Silent install ›winget install --id BytecodeAlliance.Wasmtime.Portable -eRelated guide: How to use winget: install and update apps
Also for other systems
brew install wasmtimeInformation
- Publisher
- Bytecode Alliance
- Category
- Languages & SDKs
- Licence
- Apache-2.0
- Price
- Free
- Source code
- github.com/bytecodealliance/wasmtime
- Written in
- Rust
- Requires
- Windows 11 / 10
- Architecture
- 64-bit
- Installer
- Portable
- Version
- 50.0.0
- Released
- October 20, 2026
- Added to the catalogue
- June 8, 2023
- Versions listed
- 70
- Updates / year
- 20.8
- GitHub stars
- 18,746
- GitHub forks
- 1,879
- Website
- wasmtime.dev
- winget ID
- BytecodeAlliance.Wasmtime.Portable
File types it opens (1)
Ratings and reviews
No reviews yet. Be the first to rate it.
Alternatives to Wasmtime
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Frequently asked questions
Is Wasmtime free?
Yes. Wasmtime is open-source software under the Apache-2.0 licence.
Is Wasmtime 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 Wasmtime 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 Wasmtime run on ARM (Windows on Arm)?
There is no ARM64 build; Windows 11 on Arm can run the 64-bit version through emulation.
Where can I download an older version of Wasmtime?
The versions page lists all 70 versions with links to their official installer files, back to June 8, 2023.
Can I use Wasmtime without administrator rights?
Yes, it is portable: unpack and run it.
What are alternatives to Wasmtime?
Go Programming Language, LLVM, Deno, CMake and Yarn. The alternatives page compares them.
