WhatCable reveals the truth about your USB-C cables

WhatCable: Know what your USB-C cable can do

WhatCable is a macOS menu bar app that diagnoses USB-C connections by reading what the Mac actually negotiates, not what the packaging claims. It shows charging speed, data speed, display quality, and the weak link in the chain, and flags cables that don't meet USB Power Delivery specs. Free and open source, with an optional Pro version for deeper diagnostics.