You can hand someone a URL and they get a working shell, git, npm and a coding agent with no server bill and nothing installed.

BrowserCode is an IDE and agent playground where everything executes on your own machine, inside a browser tab. Terminals, a persistent filesystem, bash, git, npm and framework dev servers run in a WebAssembly sandbox, with shareable preview URLs. Claude Code, Codex CLI and Pi run unmodified in the same tab. It is built by Leaning Technologies, the team behind WebVM, on their BrowserPod runtime (Node.js, Rust, Python). The repo is Apache-2.0 with 320 commits and 155 stars; build 1.3.0 is a beta. Free, no account; compute lives in your tab, so heavy builds lean on your laptop.

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