· Easy to read and find buttons (you might be able to touch type on a touchscreen).
· Retina graphics for iPad with Retina Display.
· Simple gestures for backspace (swipe the calculator screen) and copy & paste (double tap).
· A smaller version of the calculator in landscape for when you're just too tired to stretch your fingers.
· VoiceOver support for blind and low-vision users.
· Full support for entry via a Bluetooth keyboard, including ⌘C for copy and ⌘V for paste.
If you're under the age of 2, parental supervision is recommended. If you're over the age of 92, of course you're welcome to use Jumbo Calculator.