About this app
History calculator -zen- is a revolutionary easy-to-use calculator. ■ You can see the formula. You can see the expression you are editing. Calculate by pressing "=". ■ Calculate according to operator priority. Calculate first in parentheses. Multiplication / division is priority to addition / subtraction. ■ Calculation history can be edit. You can recalculate past calculation contents. Use the ARROW button to move the cursor, delete numbers at the cursor position, and insert numbers and symbols. ■ Advertisement is displayed. ■Disclaimer Although I am making every effort to make the calculation results done with this App, I do not guarantee its accuracy. Please understand that I will not assume any responsibility for damage, loss, disadvantage, etc. caused in using this App.
Latest release
What’s New
layout adjust
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 1, 2026 · 12:29 PM Free
Screenshots
