Most screen time apps just block your phone. QuizLock makes you solve a quiz to keep using it. Set a limit (10-120 min). When time's up, a quiz appears. Solve it to continue. Fail it, phone locks automatically. Key features: - 3 quiz types: math, patterns, emoji puzzles - 3 difficulty levels (ages 6+) - Admin password for parental control - 7 languages, lightweight, no battery drain Built as a solo dev to replace complex tools like Family Link. No setup, no pairing