Abacus Lesson vs PatternMinds

This is an app that you can learn addition and subtraction using an abacus. An abacus is named "Soroban" in Japan. Do you know what an abacus is? The abacus is very simple calculator used in China, Japan, Korea and so on. Some people may say "Isn't it an unnecessary tool if you have a calculator such as a smartphone?". Answer would be "No". The biggest difference between electric calculators and the abacus is whether you need to hold it in your hand when calculating. Because of its simplicity, you will be able to easily use the abacus in your mind. Imagine that you can use calculations of about 3 digits in your life without physical tools. This app will give you the skill of calculation.

Master the art of visual logic and spatial reasoning with PatternMinds, the ultimate training ground for non-verbal reasoning puzzles. Whether preparing for school admission tests, corporate aptitude assessments, cognitive exams, or simply looking to sharpen your visual intelligence, PatternMinds offers a premium, structured learning experience on iPhone, iPad, and Mac. Discover over 3,000 high-resolution vector puzzles meticulously organized across 10 difficulty stages and key cognitive categories. KEY FEATURES: • 10 GRADED PROGRESSION STAGES: Journey from Stage 1 (Foundation) to Stage 10 (Mastermind) with structured levels that advance in complexity as your skills grow. • COMPREHENSIVE REASONING CATEGORIES: Targeted practice across essential test types: Series Completion Odd One Out Analogies & Core Relations Matrix Reasoning Mirror & Water Images Embedded Figures Paper Folding & Punching • INTEGRATED VECTOR SCRATCHPAD: Draw notes, mark shapes, and trace lines directly over the puzzle page. Supports full Apple Pencil & Apple Pencil Pro gestures: Double-Tap: Instantly toggle between drawing brush and eraser. Squeeze: Cycle your stroke brush color automatically without opening a menu. • MENSA-STYLE SPATIAL IQ ASSESSMENT: Take timed Mock Exams under realistic conditions. Our scoring algorithm evaluates both your accuracy and speed to calculate an Estimated Spatial IQ score and cognitive classification. • THE "MISTAKE BOX" REVISION DECK: Never make the same mistake twice. The app automatically tracks questions you answer incorrectly and adds them to a dedicated practice deck so you can review them until mastered. • OFFLINE PROGRESS & STATISTICS: Monitor your brain metrics with offline analytics charts. Review your history, accuracy percentages, and category strengths at any time. PRIVACY & OFFLINE-FIRST: • Zero Account Registrations: Open the app and start training immediately. • 100% Private: All bookmarks, scores, and drawing canvases are stored securely and locally on your device using Apple SwiftData. No cloud uploads, no tracking.