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Used this to tune the belts on a 3D printer. It worked flawlessly. Appreciated it storing the last 4 plucks; this ensured accurate, repeatable readings. Put your phone microphone within an inch of the belt, ideally on a stable surface, in a fixed position.
★★★★★Sven· Jun 8, 2023
App works fine. Pretty consistent results. If I hold the mic over or under the belt it works better than if pointed from the side.
★★★★★Rich Hop· Jul 30, 2025
Worked a treat. Gave consistent results within 1 or 2 htz. Used with Samsung Galaxy. Nealy got put off by others bad reviews, but I guess they had poor tech.
★☆☆☆☆Nathan Matcheson· May 15, 2026
This app does not work. Frequency readings vary wildly and most of the time no measurement is detected.
★☆☆☆☆Ben Crist· Jul 13, 2023
This app is good only to remind yourself what the acceptable frequency range is for your bike. The frequency detection is useless. Instead, use the Spectroid app with these settings: Sampling rate: 16kHz FFT size: 8192 Decimation: 1 Window: Hamming Smoothing: 0 After plucking the belt you should see all frequencies jump, but one frequency will decay slower than the rest, and Spectroid should detect it as a peak. That's the fundamental frequency that you're trying to adjust.
★☆☆☆☆Matt Michaelis· Sep 11, 2022
Worthless as far as I can tell. It gave readings on the tension of my belt that varied wildly from 20Hz all the way up to 103.
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