News for hackers. Stuff that matters.

multimillion

multimillion on Hacker News

Show HN: BrowserCode – Run Claude Code in the Browser via WebAssembly

Posted by multimillion on Monday May 11, 2026 @10:30AM
from the show-hn dept.

https://github.com/leaningtech/browsercode

We built BrowserCode, a FOSS web app to run TUI agents (Claude Code, Gemini CLI, others coming soon) fully in the browser, locally.To use BrowserCode, you'll need to login to each CLI with the corresponding login, i.e. with your Anthropic account or API key. All the data and execution stays completely local to the browser and it's persistent across sessions thanks to a disk backend based on the...

( Read More... | no comments | 3 points | on HN )
Re:Running Gemini CLI in the Browser via WebAssembly on Friday May 01, 2026 @10:05AM (#47974978)
Hello HN!

This is the first release of BrowserCode (https://github.com/leaningtech/browsercode) a WebAssembly-based runtime to run coding agents (Claude Code, OpenCode, Gemini CLI, etc) fully in the browser. BrowserCode is released under the Apache License, version 2.0.

This first preview focuses on Gemini CLI, with Claude Code following soon.

BrowserCode uses BrowserPod (https://browserpod.io), an in-browser WebAssembly-based code sandboxing technology that can currently run Node.js, python, git, bash and many other command line tools. This will further expand to Ruby / Rails, Go, Rust and eventually x64 Linux binaries.

BrowserCode is free to use and unlimited. You'll need to login with your credentials, i.e. your Google account or API key. All the data and execution stays completely local to the browser and it's persistent across sessions thanks to a disk backend based on the Origin Private File System API or IndexedDB.

This is a preview release, so please try and break it! Please report issues on GitHub (https://github.com/leaningtech/browsercode) and star the repo if you like our work. Your support will help us push this project forward.

For any question or feedback please consider joining our Discord: https://discord.leaningtech.com

Re:Show HN: CheerpJ JavaFiddle – Run Java in the browser on Friday July 14, 2017 @03:06PM (#14772359)
Hello Benji!

Please get in touch with us, your project is very exciting and would be a great use case for CheerpJ. Just drop us a line at http://leaningtech.com/cheerpj/#early.

CheerpJ has full DOM access and interoperability with JavaScript. Demos of these case study will be coming soon.

Cheers - LT

Re:Show HN: CheerpJ JavaFiddle – Run Java in the browser on Friday July 14, 2017 @08:23AM (#14769199)
You are right of course. This will keep improving over time, especially on the HTML side of things. We'll keep your comment in mind. Cheers - LT
Re:Show HN: CheerpJ JavaFiddle – Run Java in the browser on Friday July 14, 2017 @08:18AM (#14769184)
Hello there. Can you share your browser and OS? We can't replicate this here. - LT
Re:Cheerp – A C/C++ compiler for web applications on Tuesday August 12, 2014 @05:13PM (#8170217)
Cheerp, like clang (upon which it is based), can compile both C and C++ files.
Re:Duetto: a C++ compiler for the Web going beyond Emscripten and Node.js on Thursday October 31, 2013 @10:39AM (#6647026)
We will publish extensive tutorials soon, for now you can find some examples on http://leaningtech.com/duetto/examples/

In addition, the full source code of Nontetris ( http://allievi.sssup.it/jacopone/cnontetris/ ) will be published in a couple of days, with a 'guide' on porting a C++ game to Javascript with duetto.

Stefano of Leaningtech