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Story summary
- WhatCable, a free macOS app, was released to test USB-C cable capabilities.
- It reads e-marker and live negotiation data from macOS public APIs without root access.
- The app displays speed, power-delivery rating, vendor ID and shows which component limits performance.
- The $13 Pro upgrade adds real-time monitoring, diagnostics and health tracking.
- The Verge’s Sean Hollister tested the free version and said it works well despite some cables misreporting specs.
