StatDrill is an adaptive statistics practice app for iPhone - fresh, randomly generated questions across 10 topics, with a difficulty engine that adjusts to how you're doing.
No. StatDrill runs entirely on your device. Your practice history, streaks, and mastery stats are stored locally and are never uploaded or transmitted anywhere.
StatDrill generates fresh, randomized questions from scratch each time rather than pulling from a fixed bank - so you're building real understanding instead of memorizing an answer key.
Adaptive adjusts question difficulty to your recent accuracy, so you're always working at the edge of what you know. Cram gives you a longer, mixed-difficulty session across your topics. Quick Five is a short 5-question warm-up for when you only have a minute.
Each topic tracks your accuracy and attempt count as you practice. Topics move from "Learning" toward mastered as your accuracy on that topic improves over time.
StatDrill is free to start with a couple of topics. StatDrill Premium unlocks all 10 topics, unlimited daily questions, and every drill mode, billed monthly or yearly. You can cancel anytime in your Apple ID subscription settings.
Open the StatDrill Premium paywall (tap any locked topic, or Settings) and tap "Restore Purchases." It's tied to your Apple ID, not the device.
StatDrill is currently an iPhone app.
If something looks wrong, a question seems off, or you have an idea for what StatDrill should cover next, email:
Please include:
Additional topics and drill modes are under consideration for future updates. Feature requests via email above help prioritize this list.