About this app
With this calculator you only need to enter a few basic values to find the power output, torque, efficiency and revenue potential of your turbine. Handles either horizontal-axis (HAWT) or vertical-axis (VAWT) turbines. Entries can be made using imperial or metric measures. Results of the calculations can be texted or emailed as needed.
Latest release
What’s New
Updated to iOS 17+
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 16, 2026 · 12:40 AM $1.99
Screenshots
