Paddlewheel

Paddlewheel helps you control your screen time and harness it to accomplish your goals. 

Block the apps that distract you, then earn your way back in by answering flashcard quizzes correctly. You can create your own study deck or choose from default decks. Paddlewheel lets you make progress toward your professional, educational, and personal study goals without getting rid of your smart phone.

HOW IT WORKS
1. Choose which apps to block (social media, games, etc.)
2. Build or browse flashcard decks on any subject
3. Take a quiz — get enough answers right to unlock your apps
4. Earn 15 minutes to 4 hours of free time
5. When time runs out, apps lock again automatically

Your blocked apps stay locked until you prove what you know. It's
accountability meets education.

BUILT-IN DECK LIBRARY
Get started immediately with 50+ pre-built flashcard decks:
- Languages: Spanish, French, German, Japanese, Mandarin, Korean, and more
- Test Prep: SAT, ACT, GRE, GMAT, LSAT, MCAT
- AP Courses: Psychology, Biology, Chemistry, Calculus, US History
- Professional: CISSP, CompTIA Security+, PMP, Scrum Master
- Military: ASVAB Math, Army Values, Military Ranks
- Bible & Scripture: Salvation verses, Psalms, Proverbs, Books of the Bible
- General Knowledge: Math, US State Capitals, Chemical Elements

Or create your own decks with custom flashcards. Import your own deck if you want.

SMART FEATURES
- Multiple quiz formats: text input and multiple choice
- Fuzzy answer matching so minor typos don't count against you
- Spaced repetition (Premium) prioritizes cards you struggle with
- Study mode with starred cards and missed card review
- Streak tracking to build a daily learning habit
- Real-time countdown timer that works even when the app is closed

PREMIUM UNLOCKS
- Unlimited flashcard decks (free tier: 3 decks)
- Full deck library (50+ pre-built decks)
- Spaced repetition algorithm for optimized learning
- Streak freeze to protect your daily streak
- Advanced statistics and progress tracking

Paddlewheel uses Apple's Screen Time API to block apps at the system level.
Your app selections and data stay on your device — we never see which apps you
block.

Stop scrolling. Start learning. Let Paddlewheel turn your habits into
knowledge.