Build or true your wheels by sound. Easier and cheaper than handheld tools. Simply pluck a spoke and the tension is shown on the screen.

Save multiple wheels to iCloud and share them among your devices.

Get a visual of your wheel's tension with the 'Wheel Builder' view.

Support for many different spoke sizes, shapes, and materials.

Many mechanical tension gauges have low precision with steps of 10 kgf or more between readings. The app has much higher precision, down to 1 kgf.

What’s New

Version 3.0

Added a visual display of tension
Updated the frequency detection algorithm
iCloud backup and sharing between devices
Improved memory performance

Ratings and Reviews

2.7 out of 5
7 Ratings

7 Ratings

annoyedIKcustomer ,

It stopped saving my builds when the app closes

It worked OK for my first wheel. For the second wheel, it stopped saving any of the work I was doing. I have to re-enter the spoke count, diameter, length, etc. every time I restart the app.

Jschoef1 ,


First, it does need to be a relatively quiet setting. Second, made truing my wheel very even with having spoke tension data. Third, I have an iPhone 7 which has great not sure how it works on a legacy device or iPad.

I might even start building wheels (again) with an app like this. This app is a home run!

DesertSojourner ,

A miserable failure

After truing my wheel on the Park Tool 2.2 wheel truing stand I wanted to insure I had uniform tension on the spokes. Lacking a spoke tension gauge I checked for an app and tried this one. While the concept made sense, when I was done my wheel was horribly out of true. And when I could hear clear differences in tone the app failed to detect them. Pretty disappointing.

App Privacy

The developer, Pepelko, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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