0+ iOS apps curated and reviewed
Tolerance Helper is the household name in mechanical tolerance app, but it's far from the only option. We track 0+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 |  | Free | — | No | No | Sep 2026 | |
| 2 |  | Free | — | Yes | Yes | Sep 2026 | |
| 3 |  | Free | 4.2★ (6) | No | Yes | May 2026 | |
| 4 |  | Free | 4.1★ (16) | No | No | Sep 2026 | |
| 5 |  | Free | — | — | No | Jul 2026 | |
| 6 |  | Free | — | No | Yes | Sep 2026 | |
| 7 |  | Free | — | No | Yes | May 2026 | |
| 8 |  | Free | — | No | No | Aug 2026 |
This engineering reference tool simplifies calculating ISO standard tolerances for mechanical design and manufacturing. It provides instant calculations for hole and shaft dimensions, with support for multiple units and a user-friendly interface.
Calculate ISO fits and tolerances for shafts and bores. Supports metric and inch units, displays detailed fit definitions, and includes visual charts and educational videos.
