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 your hesitations, errors, recovery time, and rhythm, then adjusts pressure in response. It doesn't tell you if you're good at math. It shows you what your mind does when it's under load. No score. No levels. No tutorials. The Soroban is the interface. Happy to answer questions, especially about the harder design choices, like why the session ends silently without any announcement. That one was genuinely difficult to commit to.

Sorobaco

No score. No levels. The Soroban observes how you think.

No score. No levels. The Soroban observes how you think.