About this app
You can practice mental arithmetic in 30 seconds. Train your math skills by doing more mental arithmetic. ■5 types of training - Addition - Subtraction - Multiplication - Split - mix ■Features - 30 seconds of intensive training - Personal best confirmation ■Credit SE -> OtoLogic (https://otologic.jp/) BGM -> Pocket Sound (https://pocket-se.info/)
Latest release
What’s New
Compatible with iOS26. Library updated.
Audience growth
Ratings growth
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
First snapshot captured. The trend line starts after the next crawler price observation.
- First observed Aug 27, 2026 · 4:16 AM Free
Screenshots
