WhatCable macOS USB-C Inspector

Skill by ara.so — Daily 2026 Skills collection.

WhatCable is a macOS 14+ menu bar app (Swift/SwiftUI) that reads IOKit services to surface what each USB-C cable plugged into your Mac can actually do — speed, power rating, e-marker data, PDO profiles, and connected device identity — in plain English.

Project Structure

Sources/WhatCable/
├── WhatCableApp.swift          # App entry point, menu bar setup
├── ContentView.swift           # Main popover UI
├── PortSummary.swift           # Plain-English logic per port
├── PDVDO.swift                 # PD VDO bit-twiddling / spec decoding
├── IOKitReader.swift           # IOKit service queries
└── ...
scripts/
└── build-app.sh                # Universal binary + notarisation