I don’t know if Number is utilizing the Mac gestures, if not it’s on them. However the entire macOS UI is heavily using swipe gestures, which is only possible

I don’t know if Number is utilizing the Mac gestures, if not it’s on them. However the entire macOS UI is heavily using swipe gestures, which is only possible with touch surfaces. That’s also why touchpads work great on Mac. I can’t use anything other than Safari and Touchpad or Magic Mouse because I too often use the swipe slightly back to reveal the previous page to check something that I need on the current page. If my Magic Mouse breaks down, I’m immediately getting a new one.