Sorobaco vs Abacus

Sorobaco is a mental arithmetic training system built around the Soroban. Not a game. Not a tutorial. A tool that observes how you think under pressure. SESSIONS Each session unfolds across three progressive phases. Phase 1: Familiarisation. The full equation is visible: 25 + 8 = 33. Learn the gestures without cognitive pressure. Phase 2: Verification. Only the question: 25 + 8 = ?. Calculate the result and set it on the Soroban. Phase 3: Challenge. Only the operation: + 8. Hold the current value in mind and apply it, the first step toward pure mental arithmetic (Anzan). Each time you lose track and reset the Soroban, a rewind is counted. Validation is silent. When the soroban matches the target, the session continues. No buttons. No confirmation. ADAPTIVE PRESSURE There is no visible timer. The system watches your hesitations and recoveries and responds. Flow in: pressure steadies. Hesitation: pressure builds. Clean sequence: a moment of ease. The time does not punish. It responds. COGNITIVE STATES After each session, Sorobaco reflects your performance through three states: Load: slowdowns, over-conscious attention, long hesitations. Flow: continuous action, stable rhythm, comfortable pace. Automatism: rapid, implicit decisions, minimal hesitation. No scores. No stars. An honest mirror. SESSIONS END NATURALLY When your hesitation pattern sustains instability long enough, the session closes on its own. No countdown. No announcement. The flow simply stops. PRIVACY No data collected. Your practice history stays in your own iCloud. No ads. No subscriptions. One optional in-app tip to support independent development.

Abacus+ is a trainer for practicing abacus calculation. If you are just starting out, the app includes lessons that explain how to count on the abacus. Then move on to practice. Lessons Short, clear lessons show how the abacus works and how to count on it. Trainer Set up your practice to match your level and goals: - number digit length, from simple to more complex examples; - alternating paired numbers to practice techniques; - display speed, so you can find a comfortable pace and gradually speed up; - carries through 5 and 10, to train the hardest operations separately. Who it's for Kids and adults learning the abacus, practicing mental arithmetic, or keeping their counting skills sharp. Practice at your own pace, whenever it suits you, and come back every day.