Sometimes, the littlest things make the biggest differences. Take, for example, a tiny app released on May 1 that does one thing, does it well, and solves a big problem. WhatCable, created by a U.K.

Oliver Haslam has been writing about phones, computers, games, and anything else that takes a battery or plugs in for more than he'd like to admit. With a focus on mobile and laptops, Oliver is never ...