How to Use the Secret Notes App Built Into Your iPhone's Calculator

In Apple's great 2024 software refresh—specifically iOS 18, iPadOS 18, and macOS 15 Sequoia—a new tool called Math Notes was added to the Calculator and Notes apps. It's essentially a calculation canvas you can use to work out equations and draw graphs, and if you know how to get the best out of it then it can be incredibly useful.

Whether you've come across Math Notes yet or not, it's a good idea to make yourself aware of everything it can do—because it's not immediately obvious what's...