WhatCable is a simple, free Mac app to tell you wha the USB-C cable is that you have plugged in. Can it carry data? How much wattage is it capable of?

WhatCable explains cable speed, charging limits, e-marker data, and connected devices in plain English. Name a cable and it tracks how the cable actually performs over time, so you can spot the one that has started misbehaving. No more guessing why a cable charges slow or refuses to drive your display.

Super helpful.