MistakeLab vs BlankStudy

Stop making the same mistake twice. MistakeLab is the ultimate wrong answer journal (error log) and spaced repetition assistant engineered for elite students preparing for high-stakes competitive exams. Whether you are studying for the SAT, ACT, GMAT, GRE, LSAT, MCAT, CFA, or college finals, keeping a structured "error log" is the single most effective strategy recommended by top-scoring students (99th percentile) worldwide. MistakeLab automates this process, transforming your failures into exam-day breakthroughs. ▸ SNAP & EXTRACTION WITH ON-DEVICE OCR Stop wasting precious study time typing out long prompts. Instantly take a photo of any failed question from a prep book, worksheet, or computer screen. Apple's native OCR (Live Text) extracts the question text locally in seconds, creating a clean record automatically. ▸ DIAGNOSE THE ROOT CAUSE (COGNITIVE TAXONOMY) To fix a mistake, you must understand why you made it. Classify your errors under 5 distinct cognitive categories: • Content Gap: You did not know the underlying formulas or rules. • Careless Mistake: You knew the concept but made a silly calculation slip. • Misread: You missed a crucial word (e.g. "except", "not") or misread the question stem. • Concept Trap: You fell for a logical trap or distractor option. • Time Pressure: You ran out of time or panicked under the clock. Add your custom notes and actionable remediation rules (lessons learned) to ensure you don't repeat them. ▸ SCIENTIFIC SPACED REPETITION (SM-2 SRS) Reviewing a correction immediately after seeing it creates a false sense of fluency. Powered by a local adaptation of the SuperMemo-2 (SM-2) algorithm, MistakeLab schedules review sessions at mathematically optimal intervals (Day 1, Day 3, Day 7, etc.) based on your performance. • Daily Review Queue: Easily work through questions scheduled for revision today. • Fluid gestures: Swipe right to master, swipe left to keep in queue. • Rich haptic feedback via CoreHaptics for an engaging, physical review loop. ▸ ANALYZE YOUR WEAKNESS PATTERNS Stop guessing what to study. The analytics engine uses native Swift Charts to visualize: • Cognitive Failure Breakdown: Check if you suffer more from careless slips or core concept gaps. • Topic Weakness Matrix: Find which exam sections (e.g. Quantitative, Reading Comp) have the highest error density. • Learning Curve: Monitor your progress as you turn active errors into mastered concepts. ▸ 100% OFFLINE & PRIVACY FIRST Your study data is yours alone: • 100% Offline: No account signups, no external servers, no internet connection required. Review anywhere, even in library basement study rooms. • Zero Data Collection: We do not collect, store, or transmit your name, text, or photos. • PDF Booklet Export: Generate a clean, formatted PDF of your mistakes to print out or share with your tutor. Eliminate your blind spots, boost your score, and walk into your exam room with absolute confidence. Start your error journal with MistakeLab today. Support: contact.devotellix@gmail.com

Stop rewriting your study material. Cover what you need to remember and turn it into your own recall practice. BlankStudy lets you place blanks directly on PDFs, photos, images, and text, then review them with active recall on iPhone and iPad. There is no account, advertising, subscription, or in-app purchase. ■ Make blanks your way • Drag a box over any word, sentence, formula, or diagram • Create write-in blanks and grade typed answers instantly • Search a page and mask every matching term at once • Paste a term-and-answer table to create blanks in batches ■ Focus on what you miss • Track accuracy for every blank • See strong blanks in green and weak blanks in red • Review per-page statistics and filter by accuracy • Retry only blanks below 80%, 60%, 40%, or 20% ■ Spaced review that adapts FSRS-based scheduling brings difficult blanks back sooner and delays the ones you know. Optional on-device reminders tell you when a review is due. ■ Use your own material • Import PDFs, photos, images, and text • Automatically split long text into pages • Organize with folders, favorites, cover colors, bookmarks, and notes • Reveal mask groups together or step through blanks in tracking mode ■ Made for iPad and Apple Pencil Write directly over your material with pressure- and tilt-sensitive ink, an eraser, and adjustable colors and widths. ■ Your material stays yours BlankStudy saves locally first. If you sign in to iCloud, it can sync through your private CloudKit database across devices using the same Apple Account. Create password-protected backups or share a book through AirDrop and Files. The developer cannot view your study material. Available in English, 한국어, and 日本語.