Alternatively, I use a lot for a long while Tydlig. Sadly it has been stagnant for a while (I'd like to be able to save "sheets", for instance). But its interaction mode (akin to a spreadsheet, in a sense) is very refreshing.
PCalc works as a notification widget - so it looks like you can have it floating on the new iPadOS homescreen - or just pull down and swipe to access it everywhere else
