Free App Lets Mac Users Test USB-C Cables Without Hardware Dongles

WhatCable, a free menu-bar utility for Apple Silicon Macs, reads USB-C cable specs and power-delivery data directly from macOS without hardware dongles or elevated permissions. It pulls information from the Mac's port, connected device, and cable itself to show real-time voltage, current, and e-marker profiles. Software continues to displace specialized diagnostic gadgets—a hardware USB-C tester reviewed three years ago is now discontinued.