# Roll Period

> Roll Period (iPhone/iPad app by Rob Grin.)

- Source: https://appshunter.io/ios/app/roll-period/id6751540867 (this page in markdown: same URL + `.md`)
- Developer: [Rob Grin](https://appshunter.io/developer/1835670007)
- Category: Utilities
- Price: Free
- Age rating: 4+
- Requires: iOS 12.0 · 36 MB
- Languages: American English
- Released: 2025-08-29
- Data updated: 2026-05-19
- User reviews in markdown: https://appshunter.io/ios/app/roll-period/id6751540867/reviews.md

## What is Roll Period?

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.


## Version history (last 1 release)

### 1.0.0+1 — 2025-08-29

No release notes.

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-05-19.*