NumLock - Math Screen Lock
Block distracting apps with mental math—train your brain every time you unlock.
Freemium - Free to download on the App Store; offers in-app purchases / subscription for premium features (details available in-app).
About NumLock - Math Screen Lock
NumLock is an iPhone screen-time blocker that requires solving mental math to unlock blocked apps. Choose which apps to block, solve adaptive math challenges to gain a timed grace period (15 min, 30 min, 1 hour, or until midnight), and track progress via a stats dashboard and streaks. Features include 25 difficulty levels, accuracy/solve-time tracking, and a privacy-first approach with no accounts or data collection. Designed to convert phone pickups into short brain-training moments and improve focus.
Key Features
- Mental-math unlocks to access blocked apps
- Adaptive difficulty with 25 levels
- Flexible grace periods (15 min, 30 min, 1 hour, until midnight)
- Stats dashboard tracking accuracy and solve time
- Privacy-first — no accounts or data collection
Who is this for?
iPhone users who want to reduce distractions, build focus, and train their brain through short daily exercises.
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Pricing
FreemiumFree to download on the App Store; offers in-app purchases / subscription for premium features (details available in-app).
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