16+ iOS apps curated and reviewed
Out of 16+ rpmvbeltpulley apps on iOS, 9 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | 3.3★ (11) | No | Yes | Aug 2026 | |
| 2 |  | Free | 4.2★ (5) | No | Yes | Aug 2026 | |
| 3 |  | $0.99 | 4.6★ (16) | No | No | Sep 2026 | |
| 4 |  | Free | 5.0★ (1) | No | No | May 2026 | |
| 5 |  | Free | 3.6★ (5) | No | Yes | May 2026 | |
| 6 |  | Free | 4.0★ (3) | No | Yes | Aug 2026 | |
| 7 |  | $2.99 | 3.7★ (34) | No | No | Sep 2026 | |
| 8 |  | Free | — | Yes | No | Aug 2026 |
This tool measures the rotational speed of motors, ideal for hobbyists working with drivable model cars. It features noise removal, speed conversion, and a memo panel for recording measurements. Customizable skins add a personal touch to the user experience.
Measure engine RPM from sound without any tools. Simply point your phone at the exhaust of various engines like motorcycles, cars, or lawn mowers to get accurate, real-time readings. The app automatically filters background noise and indicates signal quality for reliable measurements.
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.
