nano runs real Node.js and statically linked Linux binaries directly in the browser via a tiny RISC-V Linux interpreter compiled to WASM — no containers, no servers. I always wanted a truly open-source alternative to webcontainers.io, so we built one.

It even runs the Claude Code CLI fully on the edge in your browser — perfect for portable dev environments, sandboxed CLIs, CTF setups, and some seriously crazy client-side AI experiments.