Education · iOS
Abacus: Soroban Mental Math
Bead Drills & Speed Practice
Abacus trains mental math on a Japanese soroban. You move the beads, read the number, then answer with the abacus hidden — anzan practice so sums stay in your head without a calculator.
Lessons start with beads worth 1 and 5, then add, subtract, multiply, and divide — including friend-of-5 and friend-of-10 moves when a rod fills up. Daily drills, flash cards, and anzan flashes build speed. Streaks and progress stay on this device; there is no account and no third-party analytics in this version.
Lessons walk from the first bead through multiplication and division, showing carries on the rods instead of memorizing tricks alone.
Practice includes a daily drill where you set the answer on the soroban, flash cards that ask you to name a bead pattern, and anzan that flashes a short sum then waits for the total.
Built for parents practicing with a child, students who freeze on homework, and adults who want quicker mental arithmetic. Abacus will not solve a worksheet for you — you still make the number.
Full access requires Abacus Pro after onboarding (auto-renewable weekly or yearly subscription, or optional lifetime purchase; prices in the App Store). Payment is charged to your Apple ID at confirmation. Subscriptions renew unless canceled at least 24 hours before the period ends. Manage in Settings → Apple ID → Subscriptions.
Why this app
Soroban lessons
From 1-bead and 5-bead through divide, with friend-of-5 and friend-of-10 on the rods.
Daily bead drill
Set the answer yourself on the rods — timed practice that stays honest.
Flash cards
Name the number shown in each bead pattern until recognition is automatic.
Anzan
A short sum flashes, the screen clears, and you enter the total from memory.
On-device progress
Streaks, lessons, and private notes stay local — no account required.
No tracking
Data Not Collected in this version: no third-party analytics or ad SDKs.
Who it is for
Move the beads. Hide the abacus. Keep the sum.
- Parents practicing soroban with a child
- Students who freeze on arithmetic homework
- Adults rebuilding mental math speed
- Category
- Education
- Platform
- iOS 16.4+
- Price
- Free to download. Hard paywall — Abacus Pro required for lessons, drills, and practice.
- Publisher
- Weblak
- Bundle ID
- com.app.abacus
Frequently asked questions
What is anzan?
Anzan is mental abacus practice: you visualize the soroban (or see a flash), then answer without the physical beads on screen.
Does Abacus need an account?
No. Progress, streaks, and in-app notes are stored on your device only.
Does Abacus collect my data?
This version is designed as Data Not Collected: no account, no third-party analytics, and no tracking SDKs. See the privacy policy on Weblak for details.
Do I need Abacus Pro?
Yes for full access after onboarding. Abacus Pro is offered as weekly, yearly, or lifetime (prices in the App Store). Cancel subscriptions in Apple ID → Subscriptions.
Will Abacus do my homework?
No. It trains you to make the number yourself — it is practice, not an answer engine.
Abacus is an educational practice tool. It does not replace a teacher, curriculum, or professional tutoring.
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