Web Playground

The browser playground runs the full Rumoca compiler in WebAssembly: a project file tree, Monaco editors with LSP support, simulation with plots, code generation, and package archive loading — no install required.

https://cognipilot.github.io/rumoca/

It is useful for small models, quick experiments, sharing reproductions in bug reports, and demos.

Live Examples in This Book

The runnable code blocks throughout this book (look for the ▶ Simulate button) use the same WASM package as the playground, embedded as focused mini editors:

• the same compiler, solvers, and diagnostics as the native CLI,
• Monaco-based editing with Rumoca’s completion, hover, and error checking,
• inline plots, DAE views, and per-example visualizations.

The first run on a page downloads the WASM compiler; afterwards it is cached by the browser. Models honor their experiment annotation (StopTime, Interval, Tolerance, Solver).

Limitations

• Large package trees compile more slowly than native builds.
• Browser storage and worker memory limits matter for full MSL-sized projects.
• Native interactive examples may have more solver/backend options than the browser build.

For larger models or external package development, prefer the native CLI or the VS Code extension.