+1 for fitnotes, probably the best app out there for my needs. Very flexible, gets out of the way, and has some basic analytics like plotting graphs and calculating one rep max values (which I never use). The graphs I find very useful to see if how I'm trending over many months.
I only know it on Android, looking at the iOS App Store it seems like they both hijacked the name from Android, yet that FitNotes 2 is marketed as a clone of the Android app. The other FitNotes in iOS looks totally different in function/UI
