CodeNow – CoderPad over WebRTC and WASM
I was doing a lot of Leetcode this winter, and got the idea of building something like it that used wasm in the browser rather than having to manage the complexity of executing remote code securely on a server. Once I figured that out, I thought it would be neat to make it collaborative, like Coderpad — that part was a bit tougher, but it mostly works now, using WebRTC. I'm not sure whether other people will think this is cool, but I had fun building it and learning more about wasm + WebRTC.
In plain words
CodeNow is a collaborative coding platform that runs code execution directly in the browser using WebAssembly, eliminating the need for server-side code execution. It allows multiple users to code together in real-time through WebRTC peer-to-peer connections, similar to CoderPad. The tool is designed for developers who want to practice coding problems or collaborate on code without managing complex remote execution infrastructure.
written from the facts on this page · September 2026
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