Most parental apps just block. NetDoor teaches. Every morning, your child's favorite apps lock automatically. To open them, they answer a short true/false quiz on internet safety. The shift from "you're blocked" to "you earned it" changes everything. 🧠 No punishment: Wrong answers show explanations, not longer locks. 🛡️ Deep learning: Rules appear as true & false statements. No memorizing. 🔒 100% Private: Zero network code. No servers.