Apple's Calculator app does more than help you calculate tips. With the latest OSes, it launches on iPad and lets you create a Math Note for more complex problems, among other things.

Another way to use Math Notes is using the pen tool (you can find this on top of your keyboard) that you can see on apps like Calculator and Notes, and writing out your math expressions horizontally.

Windows Calculator has a Graphing feature. We show all its features in Windows 11/10 that you can use to make mathematics more insightful.

Tired of juggling between Apple Notes and Calculator? A math feature in iOS 18 lets you solve equations instantly with just a quick settings tweak.