Question about Oral-B iO-Series 9N

on the app you can see how long is left of the optimal cleaning time and which area of the teeth has already been cleaned and whether enough has been cleaned. so you have to clean a quarter area for a certain amount of time and then change it etc. this is displayed on the app. and at the end you just have the statistics

Yes, all Oral-B brushes can also be used independently without an app.