About this app
Let's calculate for brain training! This app's name "Anzan(暗算 in Japanese)" means "Mental arithmetic", working it out in your head! Just download and start using it from now on! No Sign-up! APP FEATURES ・Difficulty by level ・10 quizzes per session ・Timer measures your calculation speed ・Quick brain training in your spare time HOW TO USE ・Just download and select level RECOMMEND ・People who want to improve calculation skills ・People who want to train in Mental arithmetic
Latest release
What’s New
Fixed a small bug.
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 Sep 13, 2026 · 5:24 AM Free
Screenshots
