Sea — In-Browser C Compiler: What you sea is what you get!

A fully-featured C code editor and compiler that runs entirely in your browser. Uses Monaco Editor and Clang compiled to WebAssembly via Wasmer SDK.

Quick Start

bun run setup    # Install deps & download clang (~30MB, one-time)
bun run dev      # Start dev server
bun run build    # Build for production
bun run preview  # Preview production build

Build & Deploy

dist/ contains the static site after bun run build. Upload it to any static host (GitHub Pages, Netlify, Vercel, etc).

For best performance, set these headers:

Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: require-corp

If you can't set headers, the service worker will polyfill (may require reload).

Dependencies

All dependencies are managed via Bun:

Package	Purpose
monaco-editor	Code editor (VS Code UI)
vite	Build tool & dev server
typescript	Type safety

Updating Dependencies

bun outdated      # Check for updates
bun update        # Update all
bun add <pkg>     # Add/update specific package
bun run build     # Rebuild

Features

• Real Clang compiler (not an interpreter)
• Standard C library (stdio.h, etc)
• Monaco Editor (syntax, shortcuts)
• Example programs included
• Stdin support
• 100% client-side

How It Works

1. C code is written to a virtual FS
2. Clang (WASM) compiles to WebAssembly
3. Output runs in-browser

On first load, Clang (~30MB) is downloaded & cached.

Requirements

• Bun (package manager and runtime)
• Modern browser (WebAssembly, SharedArrayBuffer)

License

MIT