About this app
RollPeriod transforms your smartphone into a practical tool for vessel motion analysis. Using the built-in accelerometer, gyroscope, and GPS, the app provides real-time measurements and insights: Roll and pitch periods calculated with zero-crossing detection and FFT analysis. Accurate vessel speed by combining GPS and IMU data. Interactive visuals including a compass, wave direction, and real-time charts. Risk assessment with alerts and recommendations for safer navigation. Data import and export with CSV file support. Whether you are a sailor, marine engineer, or navigation enthusiast, RollPeriod helps you better understand vessel dynamics and make safer decisions at sea.
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 · 2:27 PM Free
Screenshots
