WhatCable: Know what your USB-C cable can do

WhatCable is a tool that identifies USB-C cables and explains their capabilities in plain English by reading the cable's e-marker identity, charger specifications, and actual device negotiation rather than relying on manufacturer claims alone. The app diagnoses charging bottlenecks, data-speed limitations, and display issues by analyzing what the cable, charger, and connected device actually support together. Users can contribute their cable observations to a public searchable database to build a real-world record of how cables perform across different hardware.