USB-C cables can often be a source of confusion for many users. With the lack of clear labeling on cables, it can be challenging to determine their data transfer rates or power delivery capabilities. Enter WhatCable, a new Mac application developed by Darryl Morley, designed to demystify this aspect of technology. This free tool extracts valuable information that macOS receives regarding USB-C ports as well as the MagSafe charging connection. Besides providing information on power delivery and data throughput, WhatCable also communicates the available bandwidth for video transmission to an external monitor. The app can even read data from the chips embedded within the cable and verify whether there is a USB-IF certification, and if so, which one. Additionally, it retrieves so-called E-Marker data.
Understanding WhatCable’s Functionality
Importantly, WhatCable is not intended to replace the various physical cable testers available on the market. Instead, it focuses solely on the data that macOS can access and read through Apple’s official APIs. It’s worth noting that the application is exclusively compatible with Apple Silicon machines; Intel Macs with USB-C cannot utilize it since public APIs are not available for them, as Morley explains. Furthermore, WhatCable does not use helper daemons or background data uploads, ensuring a straightforward user experience. Additionally, the app is open-source and available under the MIT license.
How It Works
Upon connecting a USB-C device, WhatCable immediately displays its performance capabilities — represented as a small icon alongside the maximum available speed and power delivery. The app can either reside in the menu bar or operate as a dock application with its icon. Most of the functionalities are available for free, and installation can be done via download or Homebrew. There’s also an option to use the app via the command line, making it versatile for different types of users.
Exploring the Pro Version
For the average user, WhatCable’s free version typically suffices. However, for £10 (approximately €12.20 using Stripe), users can upgrade to a Pro variant. This version offers advanced features, such as saving existing cables in a history log, providing more diagnostic data (including data throughput and refresh rates), and incorporating live power metering to monitor how much power (in watts, amps, and volts) is currently flowing into the Mac. The command line interface mode also comes with its dashboard, enhancing user experience even further.
Conclusion
As USB-C becomes increasingly common in the tech landscape, tools like WhatCable play a crucial role in helping users navigate and understand their connections. With its ability to provide detailed insights into cable performance and compatibility, users can make informed decisions about their equipment. Whether you’re a casual user or a tech enthusiast, WhatCable promises to be an invaluable resource in your digital toolkit.
