250+ iOS apps curated and reviewed
Out of 250+ pulley calculator easy apps on iOS, 13 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 | — | No | No | Jun 2026 | |
| 2 |  | $2.99 | 3.7★ (34) | No | No | Oct 2026 | |
| 3 |  | $0.99 | 4.6★ (16) | No | No | Sep 2026 | |
| 4 |  | $4.99 | — | No | No | Aug 2026 | |
| 5 |  | Free | 4.9★ (409K) | Yes | No | Oct 2026 | |
| 6 |  | Free | 4.7★ (61K) | No | No | Oct 2026 | |
| 7 |  | $1.99 | 1.3★ (3) | No | No | May 2026 | |
| 8 |  | $1.99 | — | No | No | Oct 2026 |
This engineering calculator helps determine belt length, ratio, RPM, and belt speed for pulley systems. It offers instant calculations with copyable results and includes formulas for reference.
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.
