Flash Mental Math (Anzan)
Not in any tracked top chart right now.
Updated 19 Oct 2026 · rankings refresh through the day
DeveloperSIC Company Limited
CategoryEducation
PriceFree
Released
Rating★ 4.6 (74)
Version3.5.1
Age rating4+
First seen by us
13 Oct 2026
13 Oct 2026Rating
4.6 ★
74 ratings
Measured
Flash Mental Math (Anzan) on the App Store
App details
App ID
6749636736
Publisher
SIC Company Limited
On the store since
Aug 2025
1 year on the store
Minimum OS
iOS 15.0+
iPhone 6s and later
Devices
iPhone · iPad
Universal purchase
Content rating
4+
Languages
9
EN FR DE IT JA KO PT ZH ES
Size
57 MB
Where it ranks now
Every top chart it appears in across 30 countries.
| Country | Charts | Rank |
|---|---|---|
| Not charting right now. | ||
Ratings
App Store, worldwide.
Rating
4.6 ★
74 ratings
Measured
Ratings
74
Measured
About Flash Mental Math (Anzan)
A flash anzan trainer built around precise timing. The numbers keep an exact rhythm and the sound lands with them, so even at high speed you can keep your mind on the calculation.
THREE THINGS ABOUT THIS APP
Precise display and sound
The moment each number appears is worked out from the time since the start, on every frame, so the spacing never drifts however many numbers there are. The sound plays at the same moment the number changes.
From 20 Kyu to 20 Dan, step by step
You start with 2 one-digit numbers and work up as the count grows and the time shrinks. Test Mode puts you through the same 40 grades as the abacus, from 20 Kyu to 20 Dan. Ten questions, seven right to pass.
Compete with your class
Set the same Room ID and you see a ranking of just that room. A soroban class or a family can share one Room ID and keep practising against people they know. There is a global ranking too.
MAIN FEATURES
Stages
1 to 6 digits, 350 steps per digit, 2,100 in all. The count of numbers and the speed change little by little.
Test Mode
40 grades from 20 Kyu to 20 Dan. Ten questions a round, seven right to pass. Grades you pass are recorded. From 20 Kyu to 17 Kyu the first number appears as abacus beads.
Rankings
Five rankings: stages cleared, test grade, attempts, login streak and total logins. Global and room, both. No account and no sign-in. You can change your display name and Room ID in the settings.
Custom Mode (monthly plan)
Choose the digits, the count of numbers, the seconds and how many questions run back to back. Digits 1 to 7, numbers 2 to 30, seconds in steps of 0.1, and 1 to 30 questions.
Display settings
Four text colours and two fonts. Light and dark modes.
Login streak
Counts the days you keep coming back, and the total. You can compare those in the rankings too.
WHO IT IS FOR
• People learning at a soroban class who want to practise flash anzan at home
• People who want grades to aim at while they practise
• Teachers who want their students practising on the same terms
• Adults who want to work their head
FREE AND THE MONTHLY PLAN
All 2,100 stages, Test Mode and the rankings are free. The monthly plan removes the ads and unlocks Custom Mode.
QUESTIONS
Do I need an account?
No. Open it and practise. A display name is given to you and you can change it in the settings.
What age is it for?
Once you can add numbers. It starts at 2 one-digit numbers in 4 seconds.
Can a soroban class use it?
Yes. Set the same Room ID and the ranking covers just that class.
Can I practise multiplication or division?
No. This app is addition only.
LANGUAGES
Japanese, English, Chinese (Simplified), Korean, Spanish, Portuguese, French, German and Italian. It follows the language of your device.
Note: the Kyu and Dan grades in Test Mode are our own yardstick inside the app. They are not connected to any examining body.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
THREE THINGS ABOUT THIS APP
Precise display and sound
The moment each number appears is worked out from the time since the start, on every frame, so the spacing never drifts however many numbers there are. The sound plays at the same moment the number changes.
From 20 Kyu to 20 Dan, step by step
You start with 2 one-digit numbers and work up as the count grows and the time shrinks. Test Mode puts you through the same 40 grades as the abacus, from 20 Kyu to 20 Dan. Ten questions, seven right to pass.
Compete with your class
Set the same Room ID and you see a ranking of just that room. A soroban class or a family can share one Room ID and keep practising against people they know. There is a global ranking too.
MAIN FEATURES
Stages
1 to 6 digits, 350 steps per digit, 2,100 in all. The count of numbers and the speed change little by little.
Test Mode
40 grades from 20 Kyu to 20 Dan. Ten questions a round, seven right to pass. Grades you pass are recorded. From 20 Kyu to 17 Kyu the first number appears as abacus beads.
Rankings
Five rankings: stages cleared, test grade, attempts, login streak and total logins. Global and room, both. No account and no sign-in. You can change your display name and Room ID in the settings.
Custom Mode (monthly plan)
Choose the digits, the count of numbers, the seconds and how many questions run back to back. Digits 1 to 7, numbers 2 to 30, seconds in steps of 0.1, and 1 to 30 questions.
Display settings
Four text colours and two fonts. Light and dark modes.
Login streak
Counts the days you keep coming back, and the total. You can compare those in the rankings too.
WHO IT IS FOR
• People learning at a soroban class who want to practise flash anzan at home
• People who want grades to aim at while they practise
• Teachers who want their students practising on the same terms
• Adults who want to work their head
FREE AND THE MONTHLY PLAN
All 2,100 stages, Test Mode and the rankings are free. The monthly plan removes the ads and unlocks Custom Mode.
QUESTIONS
Do I need an account?
No. Open it and practise. A display name is given to you and you can change it in the settings.
What age is it for?
Once you can add numbers. It starts at 2 one-digit numbers in 4 seconds.
Can a soroban class use it?
Yes. Set the same Room ID and the ranking covers just that class.
Can I practise multiplication or division?
No. This app is addition only.
LANGUAGES
Japanese, English, Chinese (Simplified), Korean, Spanish, Portuguese, French, German and Italian. It follows the language of your device.
Note: the Kyu and Dan grades in Test Mode are our own yardstick inside the app. They are not connected to any examining body.
Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Latest updates
3.5.1
Fixed a few bugs!
