Apps by Katsuhiko Yao
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Education

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Katsuhiko Yao

Free download In-app purchases unconfirmed
Open on Apple

About this app

This app displays math problems at random.

Latest release

What’s New

Version 1.0.6 Feb 11, 2026

•概数(四捨五入)の問題を追加しました。 •Added new approximation (rounding) practice problems.

Audience growth

Ratings growth

Steady
7-day gain +0
Ratings / day 0.0
30-day gain +0
US rating-count history
0 ratings
0 Aug 12, 2026 · 0 ratings Aug 12, 2026

Baseline captured. Growth appears after the crawler observes a changed rating count.

Momentum comes from crawler snapshots for the tracked storefront. “Viral growth signal” means unusually fast recent rating gains; it is an indicator, not download data.

Price tracking

Price intelligence

1 captured event
Current Free
Historical low Free
Paid → free
Price history
Current Free
Free Aug 12, 2026 · Free Aug 12, 2026

First snapshot captured. The trend line starts after the next crawler price observation.

  1. First observed Aug 12, 2026 · 5:28 PM Free

Screenshots

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