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WhatCable is a macOS menu bar app that reads macOS-reported USB-C and Power Delivery data to show cable speed, power capability, display path, and bottlenecks, with an optional Pro tier and a public cable observation database.
The author explains why USB-C cable labels are unreliable and recommends using a $15 cable tester to verify actual charging and data speeds, highlighting the role of e-marker chips.
WhatCable is a free Mac app that reads USB-C cable data from Apple Silicon Macs to reveal cable capabilities like power and speed ratings.