Show HN: WhatCable, a tiny menu bar app for inspecting USB-C cables
Summary
Show HN presents WhatCable, a macOS menu bar app that reports per-port USB-C cable capabilities and charging behavior in plain English. It decodes e-marker data, charger PDOs, and device identities via IOKit, helping users understand why charging may be slow or fast. The post covers build and distribution notes, caveats (macOS-only, notarisation), and guidance for contributors.