250+ iOS apps curated and reviewed
Every iPhone needs a few good belt tension calculator apps. We benchmark 250+ 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 | — | No | No | May 2026 | |
| 2 |  | Free | 2.7★ (21) | No | No | Sep 2026 | |
| 3 |  | $0.99 | 4.6★ (16) | No | No | Sep 2026 | |
| 4 |  | $4.99 | 3.5★ (2) | No | No | Sep 2026 | |
| 5 |  | Free | — | No | No | May 2026 | |
| 6 |  | Free | — | No | No | May 2026 | |
| 7 |  | Free | 5.0★ (3) | No | No | Sep 2026 | |
| 8 |  | $1.99 | — | No | No | Sep 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.
Calculate key parameters for a two-pulley system. Input pulley sizes, speed, power, and distance to determine belt velocity, tension, torques, wrap angle, and driven pulley RPM. Supports both imperial and metric units.
