Know what your USB-C cable can really do.
Summary
WhatCable is a macOS menu-bar app and CLI that reveals what USB-C cables can actually do by reporting on speed, power capability, display paths, and other diagnostics derived from macOS data. The project emphasizes real-world testing, privacy, and interpretive labels for cable and port performance, with a free version and a Pro upgrade offering deeper diagnostics. It’s open source under MIT, runs on Apple Silicon, and is documented with install options and multilingual support.