About this app
Sample size statistical calculator. The sample size changes dinamically with every change in the inputs of margin of error, confidence level, population size and proportion.
Latest release
What’s New
This app has been updated by Apple to prepare for watchOS 27 compatibility. No new features are included. iOS 10 ready
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 4, 2026 · 4:26 AM $0.99
Screenshots
