ErrorLift SAT Math

New: Desmos Lab — train graph-first decision-making for SAT Math questions where the route matters as much as the algebra.

This app offers a one-time in-app purchase ($9.99) that unlocks repair drills, Score Leak Map, Desmos Lab, and progress tracking. The diagnostic (45 questions) and error pattern report are fully available without purchase.

To test the purchase flow in sandbox, use any sandbox Apple ID. The StoreKit product ID is "com.jtscientific.MathErrorLift.premium".

No login, account creation, or personal data is required or collected. All data is stored locally via SwiftData.

SAT is a trademark of the College Board. All question content is original and not sourced from College Board materials.