ScreenFine turns screen time into a behavioural commitment. Users set a daily limit and pay a flat $1/week. Going over generates a"fine" they redeem with real-world action (steps, a workout, pushups, mindful minutes) or it expires into a recorded slip. An AI "villain" delivers personalized roast notifications, and violations hit a public Wall of Shame. iOS Screen Time API enforced, with app shielding when you're over.