https://wiki.openstreetmap.org/wiki/IOS

Looks like there are two avaible “go map!” And “Every door”

Depends on what you want to map. Every door is for node only(shops, benches, entrances, …) but go map can also edit ways (streets, buildings, …)

Try both and see what you like. If you have question go ask them in !openstreetmap@lemmy.ml