MobileSheets supports now also iOS (and Android, Windows).
I have an Android tablet and used MobileSheets for couple weeks including two minor gigs. I’m still using the free version but my keyboard player is not convinced by the UI and I’m trying to figure out our other options 
My keyboard player uses iPad so the app should be cross platform. Plus we don’t like the idea of having to pay monthly subscription etc.
Is there any other options apart from MobileSheets? 