WhatCable Pro is a deep USB-C diagnostics tool designed specifically for Apple Silicon Macs running macOS 14+. While the free version identifies basic cable capabilities, the Pro tier offers advanced, real-time troubleshooting directly from IOKit data—requiring no extra software or root access.

Key Features

• Negotiation Diagnostics: Easily spot bottlenecks by comparing what your Mac port, cable, and connected device support side-by-side.
• Live Power Metering: Displays real-time wattage, voltage, and amperage per port, updating every 2 seconds.
• Hardware & Port Health: Tracks lifetime port errors, resets, and monitors liquid detection (LDCM) sensors.
• Advanced Insights: Offers Power Delivery (PD) contract inspection, cable resistance estimation, and DisplayPort Alt Mode lane mapping.
• Developer Friendly: Includes a CLI monitor mode (whatcable –monitor) and desktop widgets for quick tracking.

What's New:

Version 1.1.7

New

• Opacity slider. Settings > Display now has an Opacity control (50% to 100%). It dims every WhatCable surface together: the menu bar popover, the separate Pro windows, the welcome and licence screens, and the pop-up dialogs.

Improved

• The updater checks for the newest version right before it installs. When you hit install, WhatCable re-checks for the latest release first, and the update panel refreshes itself when you open it, so you always get the current
  version. Thanks to the report behind this one.
• Contributing diagnostic data no longer pops up a "removable disk" warning.
• The Test Kit used to nudge macOS into showing its USB-storage prompt while it ran. It now skips storage devices, so the run stays quiet.

Under the hood

• Italian and Traditional Chinese wording refinements.
• More cables added to the built-in cable database.

Screenshots:

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