191+ iOS apps curated and reviewed
The best carbon drive belt tension tool apps on iPhone average 4.2★ across 191+ titles — we've ranked them by what real users actually keep on their phones. Updated November 2026.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 2.7★ (21) | No | No | Oct 2026 | |
| 2 |  | Free | 2.8★ (13) | No | No | Oct 2026 | |
| 3 |  | Free | — | No | No | May 2026 | |
| 4 |  | Free | — | No | No | May 2026 | |
| 5 |  | Free | 5.0★ (5) | No | No | Oct 2026 | |
| 6 |  | Free | 3.5★ (6) | No | No | Oct 2026 | |
| 7 |  | $1.99 | — | No | No | Oct 2026 | |
| 8 |  | Free | — | No | No | May 2026 |
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.
