A practice app for keeping up soroban homework at home. Facts learned on the beads move into mental arithmetic one at a time.
One-time purchase $19.99 · 7-day trial · no subscription
Mental arithmetic is not a replacement for the abacus — it is what comes after it. The shapes your hands learn become the beads you see in your head. This transition, which normally only a teacher can check, is handled here in five stages.
It does not wait for a whole family of facts to settle. Each fact crosses over as soon as it is learned on the beads.
A real abacus does not know how you flicked it. A screen sees the order. When a child tries to add 8 straight onto a 7 in the ones column, it can say what is missing and show the correct movement right there.
If the answer is right but the movement differs, it shows the standard movement. It is not marked wrong.
Instead of “820 points this week”, it says “6+8 (the combined five-and-ten split) averages 2.4 seconds”. That is the same language a soroban teacher uses, so you can tell what you are looking at. The week's record can be exported to take to class.
Solve on the beads. The order of movement is checked.
With the beads fading stage by stage.
Digits, count and speed set to match your class.
A timed set in the real format.
See which fact is holding them up.
Abacus practice and mental arithmetic are free, always.
Thumb-and-index finger technique cannot be observed on a screen. Learn that in class, on a real abacus. What this app teaches is the order the beads move in.
It does not replace a teacher; it is a tool for keeping practice going at home. Children who do not attend a class can start from the very beginning.
The conditions for each grade (number of terms, digits, time limit) differ between schools and certifying bodies. Adjust them in settings. Practice here does not indicate passing or failing any examination.
The 90 single-digit addition facts, split into four bead patterns, practised on the beads and in the head until they come without thinking. Subtraction, multiplication and division are not included. Flash anzan and the mock test can present longer, multi-digit problems, but those are practice formats — the facts whose mastery is tracked are the 90 additions.
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Ouchi Soroban is an iPhone / iPad app for keeping up soroban class homework at home. It has five ways to practise: Abacus practice (solving on on-screen beads), Mental arithmetic (with the beads fading stage by stage), Flash anzan, Mock test, and Records for parents. Children who do not attend a class can start from the beginning.
The app is free to download, and Ouchi Soroban's Abacus practice and Mental arithmetic are free, always. Flash anzan, Mock test and Records are unlocked by a purchase. Those three can be used without buying for 7 days from the first time you open any of them.
Ouchi Soroban covers the 90 single-digit addition facts, split into four bead patterns and practised both on the beads and in the head. Subtraction, multiplication and division are not included. Flash anzan and the mock test can also present multi-digit problems with more terms.
No. Thumb-and-index finger technique cannot be observed on a screen. What Ouchi Soroban checks is the order the beads move in. Learn finger technique in class, on a real abacus.
Ouchi Soroban stores practice records only on your device. There is no account, and no personal information is collected. Records are not synced to iCloud, so they do not transfer to a new device (purchases can be restored).
Ouchi Soroban runs on iPhone with iOS 17.0 or later and iPad with iPadOS 17.0 or later. The app interface is in Japanese only. It does not go online for practice; the only network access is for processing a purchase.