248+ iOS apps curated and reviewed
With an average user rating of 4.0★, the planetary gear calculator category is one of the App Store's strongest. Browse all 248+ apps we track, sorted so the most loved ones surface first.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | $3.99 | 4.7★ (6) | No | No | Oct 2026 | |
| 2 |  | Free | — | No | Yes | Oct 2026 | |
| 3 |  | Free | 3.7★ (3) | No | No | May 2026 | |
| 4 |  | Free | 4.7★ (61K) | No | No | Oct 2026 | |
| 5 |  | $2.99 | 3.6★ (5) | No | No | Sep 2026 | |
| 6 |  | Free | 5.0★ (1) | No | Yes | May 2026 | |
| 7 |  | $3.99 | 4.3★ (12) | No | No | Sep 2026 | |
| 8 |  | Free | — | No | No | May 2026 |
Calculate gear teeth and speed for planetary gear systems. Quickly simulate how these systems work on the fly, ideal for DIYers designing their own systems before 3D printing. Understand the formulas and components of epicyclic gear systems.
Calculate essential dimensions for spur gears and pinions using diametral pitch or module. This tool provides outside diameter, center distance, and ratio for specific gear types.
