# Belty - Belt Tuner — Sonic belt tensioner

> Sonic timing belt tensioner and calculator for precise adjustments. (iPhone/iPad app by Coby Lai.)

- Source: https://appshunter.io/ios/app/belty-belt-tuner/id6789591665 (this page in markdown: same URL + `.md`)
- Developer: [Coby Lai](https://appshunter.io/developer/6789591667)
- Category: Utilities
- Price: Free
- Rating: 5.00/5 from 3 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English
- Released: 2026-07-21
- Data updated: 2026-09-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/belty-belt-tuner/id6789591665/reviews.md

## What is Belty?

Belty — Timing Belt Tuner

Pluck a timing belt, and Belty tells you its frequency.

Measure
Real-time frequency analysis. Averages multiple plucks and reports the dominant frequency with a confidence interval, plus secondary tones for harmonic checking.

Tune
Set a target frequency and adjust the belt. A live indicator tells you tighter, looser, or on target, so you can dial in a span without stopping to re-measure.

History
Save, name, and favorite any measurement or calculation.

Also includes a tension calculator (GT2 2mm/3mm, GT3 3mm, HTD 3M, HTD 5M, MXL, XL, plus custom belts from a datasheet), giving loose, medium, and tight targets in Hz and newtons, and a belt length calculator for open-belt geometry in both directions.

Everything runs on device. No account, no data collected, no audio recorded. The mic is only used to listen to the belt.

## Key features

- Real-time frequency analysis
- Live tuning indicator
- Measurement history
- Tension calculator
- Belt length calculator
- On-device processing

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/belty-belt-tuner/id6789591665/reviews.md

### 5/5 — Just what I was looking for

*2026-07-22*

Works well on my iPhone

## Frequently asked questions about Belty

### What is Belty used for?

Belty is used to measure the frequency of a plucked timing belt, providing real-time feedback to help you tune its tension accurately. It also includes calculators for tension and belt length.

### Does Belty collect any user data?

No, Belty runs entirely on your device. It does not require an account, collect any data, or record audio. The microphone is solely used to listen to the belt.

### What types of belts can Belty calculate tension for?

Belty supports a wide range of belts including GT2 (2mm/3mm), GT3 (3mm), HTD 3M, HTD 5M, MXL, XL, and custom belts from datasheets. It provides targets in Hz and newtons for loose, medium, and tight settings.

### How does Belty provide tuning feedback?

Belty displays a live indicator that shows whether the belt is too tight, too loose, or on target. This allows for continuous adjustment without needing to stop and re-measure.

### Can I save my measurements with Belty?

Yes, Belty allows you to save, name, and favorite any measurement or calculation you make. This history feature helps you keep track of your tuning sessions.

### What devices is Belty available on?

Belty is currently available for iPhone devices. The app requires iOS 13.0 or later.

### How often is Belty updated?

The latest version of Belty is 1.1, last updated on August 2, 2026. Updates typically focus on improving accuracy and adding support for more belt types.

### Does Belty have ads?

No, Belty is completely ad-free. It is a free application with no advertisements to interrupt your workflow.

## Version history (last 2 releases)

### 1.1 — 2026-08-02

Themes, improved settings, bug fixes

### 1.0 — 2026-07-22

No release notes.

## Related topics

[belt tension](https://appshunter.io/ios/topics/belt-tension) · [belt length calculator](https://appshunter.io/ios/topics/belt-length-calculator) · [sbody belt](https://appshunter.io/ios/topics/sbody-belt) · [belt length calculator pro](https://appshunter.io/ios/topics/belt-length-calculator-pro)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-01.*