#showdev: CAN Playground — a local-first CAN bus analysis tool

A log file sits open, thousands of frames deep. Nothing looks wrong. Then one byte flips. Not randomly. Not cleanly. It flickers between two values like it’s tied to something you haven’t identified yet. You scroll. It lines up with nothing obvious. Speed? No. RPM? No. Something else. This is the part where most tools stop helping. They’ll show you the data. They won’t help you see it. So I built something that does. #showdev: CAN Playground — a local-first CAN bus analysis tool I just finished CAN Playground https://github.com/numbpill3d/can-playground It’s a desktop CAN bus analysis tool built with Tauri. You can parse logs, visualize behavior, reverse engineer signals, or capture live traffic from a SocketCAN interface. Everything runs locally. No telemetry. No network requests. Nothing leaves your machine. That wasn’t a feature I added at the end. It was the constraint the whole project grew around. The Problem I Kept Running Into Most CAN tools are built for environments where the