Does it block apps?
No. It never prevents an app from opening. Past your minutes it asks once, and Open anyway is a normal button.
What happens if I go over?
The day appears on your curve. Next week’s target is unchanged — it follows the schedule, not your slips.
Why a whole week of measuring?
Because the target has to come from your life, not a guess. A limit you didn’t earn is a limit you resent.
Can I go slower?
Yes — 4%, 6% or 10% instead of 8%, over 8, 12 or 16 weeks. A smaller step is easier to keep.
What happens after the program?
The target holds where you landed. You can start another taper, or leave it there and keep the app quiet.
Which apps can it count?
Any app you pick in Apple’s own Screen Time picker. Most people start with two or three.