ShaftCPM
Golf shaft frequency in CPM
Only for iPhone
$4.99
iPhone
Just lay your iPhone on the desk and pluck—no need to attach it to the club. See the shaft's natural frequency in CPM in real time and compare stiffness easily.
ShaftCPM is a spectrum analyzer that measures a golf shaft's natural frequency in CPM (cycles per minute) in real time.
You don't attach your phone to the club. Clamp the club to the edge of a desk, lay your iPhone flat on the desk, pluck the shaft, and tap Start. The frequency appears as a large number and a graph. Because nothing is attached to the club, its mass doesn't lower the frequency, giving good absolute accuracy.
■ Features
・Real-time CPM: analyzes the shaft's vibration and shows the natural frequency in large type.
・Spectrum & peak detection: plots the vibration spectrum and automatically detects the peak (natural frequency), with an approximate ± range.
・Desk-placement method: nothing is attached to the club, so its mass doesn't lower the reading.
・Portrait & landscape layouts.
・Japanese / English, following your device language.
■ Great for
・Comparing how stiff or soft your shafts are, as numbers.
・A reference when reshafting or checking specs.
・Measuring frequency easily without dedicated equipment.
■ Please note
Readings are approximate. Please use them as a reference, not as exact frequency measurements. They are more than adequate for comparing how stiff or soft your shafts are.
This app uses only the accelerometer—no microphone, camera, or location. It collects and transmits no personal information or data.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• New setup illustration
• Clearer instructions: the press position is now measured from the grip end (about 5 in)
• Added tips for more accurate readings
The developer, koutarou hayashi, 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 Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- koutarou hayashi
- Size
- 1.8 MB
- Category
- Sports
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Hayashi Computer
