WhatCable is a free, open-source macOS menu bar app for Apple Silicon Macs (macOS 14+) that reads USB-C and USB Power Delivery data from IOKit and presents it in plain English. It identifies cable speed (USB 2.0, USB 3.2, USB4, Thunderbolt), charging power limits, e-marker chip details (vendor, current rating, capabilities), and connected devices. Key features include charging bottleneck detection, data-speed bottleneck analysis, cable trust signals (flags suspicious e-marker values), a bundled CLI tool for terminal use and scripting, and a public cable database. The free version covers cable identity, charging info, device detection, and bottleneck verdicts. WhatCable Pro (£4.99 one-time) adds live power metering, port health counters, PD contract inspection, DP Alt Mode details, and raw VDO fingerprints. No telemetry, no network requests, fully open source under MIT license.
WhatCable
macOS menu bar app that decodes USB-C cable capabilities, charging speed, and e-marker data in plain English.
Information
- Websitewww.whatcable.uk
- Published date2026/05/24
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