# Free Mac App Reveals Why Your USB-C Charging Crawls
A new free Mac application helps users diagnose slow USB-C charging by showing exactly what power delivery specifications their cables and devices are negotiating. The app reads real-time charging data that most users never see.
USB-C cables and chargers operate at different power levels. A cable rated for 60 watts delivers far less juice than one rated for 240 watts. Your iPhone might negotiate 20 watts of power, while a MacBook Pro demands 140 watts. If your cable can't handle the wattage your device requests, charging slows to a crawl. Most people never learn why.
The app solves this mystery. It displays live information about your current charging session, including the wattage your device is actually receiving, the cable's maximum capacity, and whether your charger is performing at spec. This transparency cuts through the confusion of conflicting cable ratings and cheap knockoffs flooding the market.
Slow charging frustrates users for good reason. A MacBook Pro that should charge in two hours might take four with an undersized cable. An iPad that tops up in 30 minutes with the right setup takes twice as long with the wrong one. Phone charging that should reach 50 percent in 30 minutes crawls at a snail's pace.
The real value here is elimination of guesswork. Instead of buying multiple cables hoping one works properly, users run the app and identify exactly which cables and chargers deliver proper power. This saves money on wasted purchases and prevents damage from using incompatible equipment.
USB-C's flexibility creates this problem. The same connector handles everything from low-power devices to high-wattage laptops. Without visibility into what's actually happening during charging, users remain in the dark. Third-party cable makers sometimes misrepresent their products' capabilities,