Open-Source 'WhatCable' App Simplifies Complex USB-C Cable Capabilities for macOS Users

The Bottom Line

•WhatCable helps you identify exactly what your USB-C cables are capable of doing, including data speeds and charging bottlenecks.
•Ensure you are using an Apple Silicon Mac to utilize this tool, as it requires specific system APIs not available on Intel-based devices.

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Solving USB-C Ambiguity:

A new free, open-source macOS application called WhatCable has been launched to address the persistent confusion surrounding USB-C cable specifications. Despite the universal look of USB-C connectors, individual cables vary drastically in their support for data transfer speeds, power delivery, and display connectivity. WhatCable decodes these variables by reading data exposed by macOS, providing users with plain-language explanations of performance bottlenecks—such as whether a slow charging speed is caused by the cable, the adapter, or the connected device itself.

Technical Diagnostics:

Developed for Apple Silicon Macs, the app offers a menu bar interface and a command-line interface (CLI) for advanced users, identifying critical details like USB standards (USB 2, USB 3, USB4, Thunderbolt, DisplayPort) and power delivery contracts. It also includes 'trust signals' that compare e-marker information against official specifications to alert users to potential quality issues or non-compliant cables. This functionality is provided locally on the device, ensuring user data privacy by avoiding telemetry or external network requests.

Accessibility and Deployment:

The software is available for free through Homebrew and GitHub, supporting 19 languages, including Hindi, to assist a global user base. A paid professional version, WhatCable Pro, priced at approximately £9.99 (Rs 1,267.08), includes advanced diagnostics such as live power monitoring and port health tracking. The tool represents a significant resource for professionals and casual users alike who depend on USB-C hardware but lack the proprietary tools previously required to verify performance metrics, such as display resolution and refresh rate limits.

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Context & Background

USB-C has become the industry-standard port for smartphones, laptops, and monitors, yet physical appearances fail to indicate technical capabilities like transfer speed or power output.
Intel-based Macs lack the specific API access needed to query detailed USB-C Power Delivery information, limiting the app's functionality exclusively to Apple Silicon models.

Key Consequences

Users will gain a clearer understanding of why their devices may be suffering from charging or display performance bottlenecks.
The adoption of open-source diagnostic tools may pressure accessory manufacturers to provide more transparent labeling on retail packaging.
Professional users will benefit from the addition of real-time monitoring tools provided in the Pro version of the application.

Market & Economic Impact

No direct market impact.