Rotation Count: Turn Counter
Spin Counter & RPM Tracker
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Count rotations and RPM with your gyroscope. New turntable speed mode checks 33⅓/45/78 RPM accuracy and wow & flutter for your vinyl records.
Rotation Count turns your iPhone into a precise spin tracker. Using your device's gyroscope, it counts every rotation in real time — perfect for testing motors, tracking exercise reps, measuring drill turns, or any task where revolutions matter.
Tap Start, place your phone on the rotating object (or attach it for full revolutions), and watch the counter move. The live chart visualizes angular velocity, while direction detection tells you clockwise from counter-clockwise.
Key Features:
- Real-time rotation counting with gyroscope
- Direction detection (CW/CCW)
- Live angular velocity chart
- Min, max, and average tracking
- Session timer and elapsed display
- CSV data export for full sessions
- Min/max/average and sample-rate display
- Clean, intuitive dark interface
Perfect for hobbyists testing fan speeds, mechanics measuring drill RPM, fitness fans counting bike crank revolutions, or engineers diagnosing motor performance. Know exactly how fast — and which way — anything spins.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New turntable mode checks your record player's speed against 33⅓, 45 and 78 RPM targets and measures wow & flutter. Just place your phone on the platter and see the accuracy instantly.
The developer, Kyu-Hee Jang, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
- Identifiers
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Kyu-Hee Jang
- Size
- 59.9 MB
- Category
- Utilities
- Compatibility
Requires iOS 16.4 or later.
- iPhone
Requires iOS 16.4 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
18+
- 18+
- Contains
Advertising
- Copyright
- © Copyright 2026 Simon Jang. All rights reserved.