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.
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Free






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 | Jul 2026 | |
| 2 | Free | — | Yes | Yes | Jul 2026 | |
| 3 | Free | 4.2★ (6) | No | Yes | May 2026 | |
| 4 | Free | 4.1★ (16) | No | No | Aug 2026 | |
| 5 | Free | — | — | No | Jul 2026 | |
| 6 | Free | — | No | Yes | May 2026 | |
| 7 | Free was $4.99 | — | No | Yes | May 2026 | |
| 8 | Free | — | No | No | Aug 2026 |

















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.


This app offers a comprehensive set of tools for mechanics, providing essential data on tolerances, threads, cutting speeds, wrench sizes, and roughness. It also includes calculators for material weight, triangle properties, and trowalisation.













