This app analyzes the frequency of a plucked timing belt to help you tune it accurately. It provides real-time feedback, historical data, and includes calculators for tension and belt length.






68+ iOS apps curated and reviewed
Every iPhone needs a few good belt tension apps. We benchmark 68+ of them on App Store rating, freshness, and pricing, then surface the standouts so you don't have to scroll the App Store yourself.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 | Free | 5.0★ (3) | No | No | Sep 2026 | ||
| 2 | Free | 2.7★ (21) | No | No | Sep 2026 | ||
| 3 | Free | 3.4★ (10) | No | No | Oct 2026 | ||
| 4 | Free | — | No | No | May 2026 | ||
| 5 | Free | — | No | No | May 2026 | ||
| 6 | Free | 4.6★ (163K) | No | Yes | Oct 2026 | ||
| 7 | Free | — | No | No | Sep 2026 | ||
| 8 | Free | 5.0★ (1) | No | No | Jul 2026 |






This app analyzes the frequency of a plucked timing belt to help you tune it accurately. It provides real-time feedback, historical data, and includes calculators for tension and belt length.




This app uses your phone's microphone to measure the sonic vibration frequency of a belt drive. It helps you determine if your bicycle belt tension needs adjustment by comparing the frequency to a provided chart. It also offers a calculator for bicycle belt drive parameters like speed ratio and center distance.






This application provides a comprehensive diagnostic tool for belt drive systems. It measures key parameters like pulley speeds, belt frequency, tension, and system geometry to ensure optimal performance, energy efficiency, and extended service life.