Codex CLI compiled to WASM running in the browser
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Hi HN! As part of our ongoing work on BrowserPod, an in-browser WebAssembly sandbox, we have significantly expanded what the Rust WebAssembly target can achieve.Our approach proved so robust that we could get the whole Codex CLI (~1.25M lines of Rust, excluding dependencies) to run in the browser, with extremely minimal modifications.Now, Codex CLI by itself could not do much, but BrowserPod provides a full environment with standard Linux command line tools, bash, git, Node.js and Python, with more yet to come. All of these are compiled to WebAssembly and run concurrently on top of BrowserPod kernel.To learn more about our work on Rust and BrowserPod in general: https://labs.leaningtech.com/blog/browserpod-rust
HN · launched Aug 19, 2026 · 5 upvotes (top 87%) · 0 views
Niche: browser code execution environments · 38 launches, 4 in the last 7 days · Explore this niche →
Category and tags
- Horizontal
- Dev tools
- Developer
- AI-native
- Hobby / open-source project
Visit website ↗ Source listing ↗
More like this: all 38 launches in browser code execution environments →
Could you build this?
No Compiling a 1.25M line complex Rust CLI with system/network dependencies to WebAssembly to run in an in-browser sandbox requires deep browser WASI runtime virtualization and systems engineering.
What it would actually take: This requires building an in-browser virtual POSIX execution layer (virtual filesystem, network polyfills via WebSockets/WebRTC, threads via Web Workers/SharedArrayBuffer) and heavily patching crates that depend on native system calls. Achieving this level of compilation and execution needs expert low-level Rust and WASM runtime/compiler engineering.
Discussion
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Competitors mentioned: OpenAI
Competitors
Other products that read as similar to this one : 763 launches clear the similarity bar, closest 8 shown.
Attention rank: #662 of 764 (itself plus its competitors, highest first, normalized so YC and Product Hunt are compared fairly).
Launched 291 days after the earliest competitor.
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