Coi – A language that compiles to WASM, beats React/Vue
I usually build web games in C++, but using Emscripten always felt like overkill for what I was doing. I don't need full POSIX emulation or a massive standard library just to render some stuff to a canvas and handle basic UI. The main thing I wanted to solve was the JS/WASM interop bottleneck. Instead of using the standard glue code for every call, I moved everything to a Shared Memory architecture using Command and Event buffers. The way it works is that I batch all the instructions in WASM and then just send a single "flush" signal to JS. The JS side then reads everything directly out…
Coi – A language that compiles to WASM, beats React/Vue launched on January 20, 2026 with 225 votes, #121 of 14,585 launches that month and more than 99% of that year's launches.
In plain words
Coi is a programming language that compiles to WebAssembly for building web applications and games. Designed for developers who find standard approaches like Emscripten unnecessarily heavy, it uses a shared memory architecture to minimize JavaScript-WebAssembly communication overhead. The language features a component-based design that simplifies DOM logic compared to writing it directly in C++. Coi targets web developers seeking better performance for graphics-heavy applications, particularly those building web games or interactive canvas-based content.
written from the facts on this page · September 2026
From the sources
In the maker’s words, at launch
I usually build web games in C++, but using Emscripten always felt like overkill for what I was doing. I don't need full POSIX emulation or a massive standard library just to render some stuff to a canvas and handle basic UI. The main thing I wanted to solve was the JS/WASM interop bottleneck. Instead of using…
Does a similar job
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I made this because building UIs in a lexical medium like code is super annoying. I have to pre-render what I’m making in my head, and then jump between the browser and IDE to test. I was inspired by the developer console in chrome and safari since I end up editing css there because it’s ironically more convenient. Hope it’s useful!
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I built a WASI playground for running CLI binaries in the browser2022 · runno.dev · ▲115Run WebAssembly made for outside the browser, inside the browser.
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Hi! I made a React compatibility library for a Virtual DOM library (https://github.com/aidenybai/million). The idea is to have much faster rendering (a compiler optimizes virtual DOM beforehand) while ensuring the same developer experience React provides. This is very, VERY early stage, so be prepared for weird bugs / plugin incompatibility / etc. If you have any suggestions, I'd be more than happy if you replied in a comment with it! You can spin up the demo here >> https://stackblitz.com/github/aidenybai/million-react-compat
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