Sorobaco
Soroban mental math trainer
Free · In‑App Purchases · Designed for iPad
Three phases of arithmetic training. Adaptive pressure. Cognitive state tracking. No scores, no levels. Just you and the Soroban.
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. No ads. No subscriptions. One optional in-app tip to support independent development.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Mercurio Solutions, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- MERCURIO SAS DI INFANTE LUCA & C.
- Size
- 1.3 MB
- Category
- Education
- Compatibility
Requires iOS 26.2 or later.
- iPhone
Requires iOS 26.2 or later. - iPad
Requires iPadOS 26.2 or later. - Mac
Requires macOS 26.2 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.2 or later.
- iPhone
- Languages
English and 2 more
- English, Italian, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Support Sorobaco $1.99
- Copyright
- © 2026 Mercurio Solutions
