Diagnostic Protocol Initiated
ErrorLift finds the exact mistake patterns behind missed SAT Math points and generates targeted repair drills designed to address your specific weaknesses.
The Problem
Most SAT Math prep treats every miss as a content gap. ErrorLift treats them as what they actually are: repeating mistake patterns that surface across different question types.
Map the exact conceptual frailties behind missed SAT Math points — not just which topics, but which step in your thinking breaks down.
Run short drills engineered to patch the detected vulnerability — near transfer, far transfer, and a transfer check to confirm the fix held.
Track node stabilization across all five error patterns and grow toward test-ready math behavior with a real-time readiness score.
How It Works
ErrorLift moves you from "I keep getting these wrong" to "I know exactly why — and I've fixed it."
Answer 45 original SAT-style questions. ErrorLift tracks accuracy, time spent, your confidence level, and — after a wrong answer — your self-reported failure mode. It uses this multi-signal evidence to assign each miss to one of five mistake patterns with confirmed, likely, or uncertain confidence.
Each detected pattern triggers a 5-step repair: three near-transfer drills that isolate the exact vulnerability, a far-transfer problem that tests whether the fix holds under surface-level changes, and a transfer check that determines whether the pattern is stable or still fragile.
The Score Leak Map shows every pattern ranked from most to least exposed. Statuses move from Detected → Repairing → Fragile → Stable → Test Ready as you work. The Desmos Lab adds a separate track for training graph-first and table-first decision-making.
Five Tracked Patterns
ErrorLift covers the five highest-value SAT Math error categories — the ones responsible for most of the gap between 650 and 750+.
You set up the problem correctly and solve it correctly — then report the wrong quantity. The algebra was right; the question was misread at the end.
You apply the percent change correctly, but to the wrong starting value. The most common form: using the new price as the base when calculating a reverse percent.
Your approach is correct until signs, subtraction, or distributing a negative break the algebra. The setup is right; the execution breaks down at one specific step.
You pick a workable algebraic method, but not the optimal structure for this question type. You get the answer eventually — but with more work and more error exposure than necessary.
A graph or table would have been faster and safer. Desmos Lab trains you to recognize these questions before you commit to a long algebraic setup.
Pricing
Keep all repair tools, maps, and labs — forever. The full diagnostic and your error pattern report are always free.
Free
No account required
Full Access — $9.99
One-time purchase · No subscription
App Screenshots
Five screens from inside the app.
The onboarding screen that explains the diagnostic-to-repair approach before you start. The Diagnose / Repair / Lift step cards frame the app's philosophy upfront.
A SAT-style question mid-diagnostic showing the progress bar, timer, four answer choices (one selected in cyan), confidence selector (Medium highlighted), and the Submit / I'm stuck buttons.
The sheet that appears after a wrong answer: the pattern name in large type ("Percent Base Error"), confidence badge (CONFIRMED), evidence bullets, the correct solution, and Start Repair / Continue Diagnostic buttons.
All five error patterns ranked by severity with status badges: FRAGILE, REPAIRING, DETECTED, STABLE, NOT TESTED. Each card shows accuracy, session count, and a Repair CTA.
The Desmos Lab module list showing Graph Intersection, Table Evaluation, Function Transformation, Regression/Model Fit, and Exact vs Approximate. Chips: Route choice · Time save · Lower error risk.
Privacy Policy
Effective 2026-05-24
ErrorLift does not collect, transmit, or share any personal information. The app does not require you to create an account, log in, or provide any personal details.
All session data — your answers, time spent, confidence levels, detected error patterns, and repair progress — is stored locally on your device only using Apple's SwiftData framework and never leaves your device.
The Full Access purchase is processed entirely by Apple through the App Store. We do not receive, store, or have access to your payment card details or billing information. Purchase data is governed by Apple's Privacy Policy.
The app integrates no third-party analytics, advertising, or data-sharing services. If a third-party SDK is added in a future update, this policy will be updated before that version ships.
Because no personal information is collected or transmitted, the app is not subject to COPPA data-collection requirements. The app is suitable for users of all ages.
All app data is stored locally and is deleted when you delete the app. We have no server-side copies and cannot retrieve or delete your data on your behalf.
We may update this Privacy Policy from time to time. Material changes will be communicated via an app update. Continued use of the app after a policy change constitutes acceptance.
Questions about privacy: jtscientific2016@gmail.com
Terms of Service
Effective 2026-05-24 · By using ErrorLift you agree to these terms.
We grant you a personal, non-exclusive, non-transferable, revocable license to use the app on any Apple device you own or control. You may not copy, modify, distribute, reverse-engineer, or use the app for commercial purposes without written permission.
The Full Access purchase ($9.99) is non-refundable except as required by applicable law or Apple's refund policies. You may restore your purchase on any device signed in to the same Apple ID using the "Restore Purchase" feature. Prices are displayed in your local currency as provided by Apple.
All content — including question text, explanations, diagnostic logic, repair sequences, and interface design — is owned by or licensed to us and protected by applicable intellectual property laws. The 500-question bank and all diagnostic and repair content are proprietary.
THE APP IS PROVIDED "AS IS" WITHOUT WARRANTIES OF ANY KIND. WE DO NOT WARRANT THAT THE APP WILL BE ERROR-FREE, UNINTERRUPTED, OR THAT USE OF THE APP WILL RESULT IN ANY PARTICULAR SAT SCORE IMPROVEMENT.
TO THE MAXIMUM EXTENT PERMITTED BY APPLICABLE LAW, WE SHALL NOT BE LIABLE FOR ANY INDIRECT, INCIDENTAL, SPECIAL, OR CONSEQUENTIAL DAMAGES. OUR TOTAL LIABILITY SHALL NOT EXCEED THE AMOUNT YOU PAID FOR THE APP.
These Terms are governed by the laws of the State of California, United States, without regard to its conflict-of-law provisions. Disputes shall be resolved in the courts of California.
We may revise these Terms at any time. Continued use of the app after a revision constitutes acceptance. Contact us at jtscientific2016@gmail.com with any questions.
Disclaimers
SAT® is a trademark registered by the College Board. The College Board is not affiliated with, and does not endorse, this application, its content, or its diagnostic or scoring methodologies. All references to the SAT® exam are for descriptive and educational purposes only. All question content in this app is original and not sourced from College Board materials.
ErrorLift is designed to help users identify and address recurring mistake patterns in SAT Math. We make no representation or guarantee — express or implied — that use of this app will result in any specific score improvement on the SAT® or any other standardized test. Individual results will vary.
This app is an educational tool, not a substitute for comprehensive test preparation, professional tutoring, classroom instruction, or official College Board preparation materials.
While we make every reasonable effort to ensure all questions, answers, and explanations are mathematically correct, we do not guarantee the app is entirely free from errors. Report content issues to jtscientific2016@gmail.com.
The Desmos Lab feature references Desmos, a graphing calculator. Desmos is not affiliated with, and does not endorse, this app. Desmos is a trademark of Desmos Studio, PBC.
Contact
For support, content errors, privacy questions, or feedback about ErrorLift.
✉ jtscientific2016@gmail.comDeveloped by Jianyong Tang · California, United States