> have no single, definitive "good" calculator on either iOS or Android When your device has an app store or allows third party software in some other way it w

> have no single, definitive "good" calculator on either iOS or Android When your device has an app store or allows third party software in some other way it will never have a "single definitive good app" for anything, there will be many bad ones and a maybe a couple of good ones, for math there's this good one: https://github.com/mkulesh/microMathematics https://github.com/mkulesh/microMathematics