I'd love for someone to prove me wrong here but I have a Google Home that I'd like to replace with an iPad. One thing it does beyond just showing pictures is brighten and dim the screen according to ambient light. When the lights are off it dims entirely into a night mode-like display that just shows the time. I've not seen an iOS app capable of the same (I'm not even sure if API access allows it?)
> I've not seen an iOS app capable of the same (I'm not even sure if API access allows it?)
I don't believe apps can change system brightness settings themselves, but iOS does have an auto-brightness feature, and the app can additionally dim images or change what's displayed based on brightness or movement (using Camera access), time of day, and other signals.