# Keisan-Hakusho

> Keisan-Hakusho (iPhone/iPad app by Takumi Seki.)

- Source: https://appshunter.io/ios/app/keisan-hakusho/id6740030538 (this page in markdown: same URL + `.md`)
- Developer: [Takumi Seki](https://appshunter.io/developer/1546622179)
- Category: Games
- Price: Free
- Age rating: 4+
- Requires: iOS 13.0 · 86 MB
- Languages: Japanese
- Released: 2025-01-05
- Data updated: 2026-07-06
- User reviews in markdown: https://appshunter.io/ios/app/keisan-hakusho/id6740030538/reviews.md

## What is Keisan?

A calculation power training app that solves many mental calculations within a time limit.
Activate your brain by improving your judgment, concentration, and mental arithmetic skills!



How to play
[Normal mode]
Aim for your personal best by solving as many questions as possible within the 30 second time limit!
You can select the calculation method from [Addition/Subtraction/Multiplication/Division].
You can select the difficulty level from [Easy/Normal/Slightly Difficult/Difficult].



[National exam mode]
Solve many problems within 60 seconds and compete with players from all over the world!


## Version history (last 1 release)

### 1.0.3 — 2025-02-11

Fixed some UI.

## More apps by Takumi Seki

- [Janken-Shot](https://appshunter.io/ios/app/janken-shot/id1546622177)
- [Obake-Touch](https://appshunter.io/ios/app/obake-touch/id1590711153)

All apps by Takumi Seki: https://appshunter.io/developer/1546622179

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-06.*