Supported Features
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Differentiate Without Color Alone
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Reduced Motion
Sorobaco: Soroban Mental Math
Abacus training toward anzan
Free · In‑App Purchases
Not a game and not a tutorial. It is mental arithmetic training built around the soroban, and it watches how you think when the clock is running.
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
Sorobaco now speaks Portuguese, both the European and the Brazilian form, which brings it to five languages.
It also follows the Reduce Motion setting. With that on, the pulse under the question mark and the shudder that marks a mistake give way to quieter changes that say the same thing without moving anything on screen.
Three buttons on the Home screen were announcing the icon rather than the place they open, and VoiceOver repeated that faithfully. They now say what they do. The piece called Toward anzan has been rewritten.
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.
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- MERCURIO SAS DI INFANTE LUCA & C.
- Size
- 1.4 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 26.0 or later. - Apple Vision
Requires visionOS 26.2 or later.
- iPhone
- Languages
English and 3 more
- English, Italian, Portuguese, Spanish
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Support Sorobaco $1.99
- Copyright
- © 2026 Mercurio Solutions
