WhatCable is a macOS menu bar app for Apple Silicon Macs running macOS Sonoma or later that provides detailed, plain-English information about the capabilities of each USB-C cable connected to your Mac, including charging speed diagnostics and cable specifications. It leverages public IOKit services to reveal the cable's actual data and power ratings, connected devices, and negotiated power profiles, helping users understand why their Mac might be charging slowly or what each cable can do. The app also includes a command-line interface and is available for manual download or via Homebrew.
