#44th of 20 in App builder starters
wasmer
WebAssembly runtime and CLI for running code in sandboxes
- Stars
- 21.2k
- License
- MIT
- Last commit
- Nov 2026
- Last release
- Oct 2026
- Language
- Rust
20,521 on 21 Apr 202621,235 on 10 Nov 2026
From GitHub's daily star counts.
Checked on GitHub.
Overview
Wasmer is a Rust WebAssembly runtime with a CLI that downloads packages from a registry (Python, Bash, PHP, SQLite, FFmpeg, PostgreSQL via pglite) and runs them in sandboxes. File, network and environment access are opt-in, for example via --volume and --net. Alpha SDKs for JavaScript, Python, Rust and Swift, kept in a separate repo, embed sandboxes in apps and agents.
Who it is for: Engineers embedding sandboxed code execution in apps or AI agents
Ranked among open-source alternatives to Lovable (#5 of 10), v0 (#4 of 10), Bolt.new (#4 of 10) and Replit (#4 of 10).
Strengths
- File, network and environment access is denied unless granted with flags such as --volume and --net
- Runs Python, Bash, PHP, SQLite and FFmpeg from a registry without installing them on the host
- Same sandbox API across JavaScript, Python, Rust and Swift, including iOS and browser
- MIT licensed, with a Rust API and C API for lower-level WebAssembly embedding
Weaknesses
- The sandbox SDK is alpha and lives in a separate repository
- Rust SDK is a source dependency; crates.io publishing is currently disabled
- Browser execution needs cross-origin isolation headers on the page
- Not an agent framework or app builder; it provides only the sandbox layer
What it needs
- Rust
Quick answers
Is wasmer open source?
Yes. Its code is on GitHub under the MIT license.
Head to head
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