Simple Soroban (Abacus)

A complete Soroban (japanese abacus) app with tutorials, problems to solve, timed challenges, anzan training. Entirely free, with no ads or in-app purchases.

Simple Soroban is a complete Japanese abacus in your pocket. Whether you are discovering the soroban for the first time or training for serious mental calculation, everything is included and everything is free. It's multi-touch and configurable, so it feels like a real soroban.

LEARN Step-by-step interactive tutorials teach you addition, subtraction, multiplication and division from scratch. No prior knowledge needed: you will learn how to read the beads, manipulate numbers, use complements, and carry across columns at your own pace.

PRACTICE Freeform mode: a realistic soroban, for homework, checkout sums or just playing with numbers Relax mode: solve calculations at your own pace and earn badges as you progress Challenge mode: race the clock and push your calculation speed to the next level Anzan mode: hides the beads so you manipulate the soroban in your mind, a technique used by mental calculation champions in Japan

MAKE IT YOURS Choose between a 7-column or 9-column soroban Multiple color themes Plenty of settings to adapt the abacus to how you practice

FREE, REALLY No ads. No in-app purchases. No accounts. No data collection. Simple Soroban is completely free, with nothing to unlock and nothing tracking you. Already trusted by millions of learners on Android, now available on iPhone. Whether you are a student learning arithmetic, a teacher looking for a classroom tool, or an adult keeping your mind sharp, Simple Soroban gives you the full path from your first bead flick to calculating entirely in your head.