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Luca Infanteleft a comment
Hey Product Hunt! I built Sorobaco because I kept thinking about one question: can a digital tool teach a physical discipline without ever explaining it? The Soroban is a 17th-century Japanese abacus. Expert practitioners use it with their eyes closed. They don't calculate, they feel the number through their hands. Sorobaco tries to replicate that. Not by teaching. By watching. The app tracks...
SorobacoNo score. No levels. The Soroban observes how you think.
Sorobaco is not a math game. It is not a calculator trainer.
No score, no levels, no explicit feedback. The system watches how you use the Soroban, your hesitations, errors, recovery time, rhythm and adjusts its pressure in response.
Three phases gradually take you from full equation visible to pure mental operation, building toward Anzan: arithmetic without reference.
The session ends when cognitive friction crosses a threshold. No announcement, no game over screen. The flow simply stops.
SorobacoNo score. No levels. The Soroban observes how you think.