The menu bar popover explaining a 94W Thunderbolt charger connection, with health checks and cable details
The Power Monitor showing live wattage, voltage and current graphs for a USB-C port
Display diagnostics explaining that a monitor is limited by a USB-C to HDMI adapter

Why it's here

Not for

Intel Macs: reading cable data needs Apple silicon.

About WhatCable

WhatCable reports what a plugged-in USB-C, Thunderbolt or MagSafe cable supports: charging wattage, data speed and video. It reads the cable’s e-marker chip and the negotiated power profile to explain slow charging or transfers, and flags cables that look counterfeit.