Apple Math Notes feature was introduced in iOS 18 and iPadOS 18. It lets you write, solve, and graph mathematical equations in real time. It also supports writing with Apple Pencil.

A lot of basic calculator apps don’t have a graphing feature, so the Windows 10 calculator might also be getting a leg up on rival apps.

As of next year, students in the 15 states that are administering the Smarter Balanced common-core exams will be using the Desmos calculator while they take their state math tests, rather than the ...