A founder has a near-infinite supply of legitimate reasons to pick up the phone. There is always a message that might matter, a metric that might have moved, a fire that might need putting out. That is exactly what makes the habit so hard to see. Most of those checks are not work. They are the nervous system reaching for relief and calling it responsibility.
Reminder apps and scheduled blocks assume you will respect them in the moment. But the moment is the problem. When the override is one tap and the override has no cost, the override becomes the routine, and by week two the limit is decoration. The mechanism has to refuse to be overridden cheaply. That is the difference ScreenFine is built on.
You set a daily limit and the apps it covers. Cross it and those apps lock at the operating-system level, not behind a dialog you dismiss. Phone, messages, and maps still work, so you are never actually stranded. You earn the apps back with 25 pushups, 25 squats, 1,000 steps, or 10 mindful minutes. Going over never charges you. The only cost is the flat dollar a week.