Codetoy.io

WebAssembly playground with a P5.js style API for C# and AssemblyScript (and eventually luau and python) that runs entirely in your browser.

Libraries

• env.csharp: iframe with a postMessage/onmessage API that facilitates running C# attached to an HTML Canvas with the Codetoy API (@codetoy-io/bindings.web). Uses customized fork of JakeYallop/wasmsharp.

• env.as: iframe with a postMessage/onmessage API that facilitates running AssemblyScript attached to an HTML Canvas with the Codetoy API (@codetoy-io/bindings.web)

IN-PROGRESS

• env.luau: iframe with a postMessage/onmessage API that facilitates running Luau attached to an HTML Canvas with the Codetoy API (@codetoy-io/bindings.web). I would need to fork roblox's new official playground:

  • https://github.com/luau-lang/playground

• env.py: iframe with a postMessage/onmessage API that facilitates running Python attached to an HTML Canvas with the Codetoy API (@codetoy-io/bindings.web). Still need to do more research:

  • https://github.com/SardineFish/monaco-pyright-lsp
  • https://simonwillison.net/2026/Mar/9/pluau-wasm-pyodide/
  • https://github.com/vwh/python-playground demo
  • https://pyodide.org/en/stable/
  • https://simonw.github.io/research/monty-wasm-pyodide/demo.html demo
  • https://dev.to/hasan_53_52/i-built-a-python-ide-that-runs-entirely-in-your-browser-using-webassembly-111e demo