Anyone with a drawer full of USB-C cables knows the frustration: they all look basically the same, yet hide wildly different capabilities underneath. Some charge devices at full power and move data at top speed, while others barely manage more than powering an LED light. Since the connector itself is universal, there's no way to tell them apart just by looking.
For years, the easiest fix for this headache was a small, inexpensive cable tester priced around eight dollars, which could instantly show whether a cable was fast, slow, powerful, or weak. It was cheap, intuitive, and solved the problem without fuss. Unfortunately, that gadget has since been discontinued, and nothing quite as simple or affordable has replaced it.
Now, owners of Macs powered by Apple Silicon have a solid alternative: a free application that can inspect connected USB-C cables and reveal real information about their capabilities, no extra hardware required. Simply plug in the cable and let the Mac itself run the diagnosis.
Tools like this matter because the USB-C standard, despite using a single connector shape, supports multiple tiers of charging and data-transfer performance. A cable might look perfectly fine while quietly limiting how fast a laptop charges or how quickly files move to and from an external drive. Spotting these bottlenecks visually is simply not possible.
For anyone who has dealt with mysteriously slow charging or sluggish file transfers, having a free way to check what's actually going on with their cables is welcome news. That said, there's an obvious catch: the solution currently works only on Apple Silicon Macs, leaving Intel Mac owners, along with Windows and Linux users, without an equivalent option.
Until a new physical device comes along that's as cheap and straightforward as that original tester, this app stands out as the most sensible option within Apple's ecosystem. Everyone else will have to keep relying on manual testing—or a bit of patience—until something comparable hits the market.