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I don't know what the bad reviews are talking about. I almost deleted this app before trying it, but after plucking my Zero's drive belt three times using a wrench I got 59 Hertz every single time.
★★★★★IO· Dec 30, 2025
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.
★★★★★Thomas Forth· Jul 26, 2024
Helps you get the tension right on your Gates belt drive. Amazing that this works. And it does!
★☆☆☆☆Nathan Matcheson· May 15, 2026
This app does not work. Frequency readings vary wildly and most of the time no measurement is detected.
★★☆☆☆Colter Cederlof· Jun 13, 2024
First, their symbols for microphone recording is bad. When the microphone is blue, then that means it's recording. I thought it was a button that I needed to press to start recording. Second, as I pluck the belt, I don't get near consistent frequencies. I get 20Hz, 40Hz, and 85Hz among others. This means the method of plucking has enough variation to render the test useless for tuning. There's gotta be a better way. I'll pay for a tool that'll physically measure the tension.
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