If you’re intrigued by the notion of adding a physical keyboard to your iPad but fret about the extra bulk, the keyboard you want is Logitech’s $99.99 Ultrathin Keyboard Cover. It is, indeed, ultra-thin, and uses magnets to click onto the iPad, both as a cover and when you’ve set it up for typing. The battery runs for months on a charge, too. If Apple designed its own iPad keyboard/cover, it would probably look a lot like this one — and it was the first third-party keyboard Apple deemed cool enough to sell in its stores.