Keep is an app my wife and i use quite a bit and would love to find an alternative on iOS (if there is also an Android app that would be a huge plus, our son has an Android)
I think Apple Notes may be the change we make. Everything else i am seeing is trying to incorporate google docs and a lot of other things into a sticky note app.
Go for it! It’s not as feature rich as the competitors but once you get the hang of it and have a routine it’s great. There’s also no additional cost. Others oftentimes have a premium subscription tier.