RamenRouter

RamenRouter is a free, browser-based PCB autorouter built for hobbyists who want to squeeze components onto the smallest, cheapest board possible. Extra layers, finer traces, and smaller holes all cost money — so RamenRouter fixes those constraints and does the algorithmic gymnastics for you.

The workflow is simple: place your components and set board rules in your PCB editor, export a .dsn file, load it into RamenRouter, and hit Start routing. It recognizes EasyEDA Standard exports (including older flattened layouts) and honors declared units for other CAD formats. Per-net rules let you choose main routing layers, prefer shorter routes for length-critical nets, and keep routes a configurable clearance away from the board edge.

Routing is resumable: when the time budget or attempt count runs out, you can extend time, add attempts, refine the current best, or try flexible finishing for the last stubborn connections — always keeping the best checked result. Export back to a routed DSN or an SES session for your PCB editor, plus a check report and job log.

Everything runs in your browser on your own computer — no install, no upload. You can even download the app folder and run it fully offline. The author describes it as 100% vibe-coded.