About this app
It is a standard flash mental arithmetic app. You can choose the difficulty level that suits your abilities. Please take advantage of this app to mental arithmetic training or anti-aging.
Latest release
What’s New
Version 1.9
Jan 10, 2021
some bug fixes
Audience growth
Ratings growth
7-day gain
+0
Ratings / day
0.0
30-day gain
+0
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
Current
Free
Historical low
Free
Paid → free
0×
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Sep 2, 2026 · 7:59 AM Free
Screenshots
