# Fit Tolerance ANSI vs mechanical design engine

The clearest difference is ads: mechanical design engine at none against Fit Tolerance ANSI's shown. mechanical design engine also leads on update cadence (every 2 months vs every 9 months) and iOS requirement (13.0 vs 15.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Fit Tolerance ANSI ships an update every 9 months, mechanical design engine every 2 months. The most recent releases landed on November 3, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Fit Tolerance ANSI | mechanical design engine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fit-tolerance-ansi/id1294112198/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 9 months | **Every 2 months** |
| Monetization | Ad-supported | — |
| Size | 51 MB | 63 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yasar Yucel Yesilbag](https://appshunter.io/developer/1251895011) | [gan dae choi](https://appshunter.io/developer/1574341439) |

## What reviewers say

### Fit Tolerance ANSI

[App page](https://appshunter.io/ios/app/fit-tolerance-ansi/id1294112198)

Calculate ANSI standard limits and fits for cylindrical parts like bearings and shafts. It supports various fit types based on inch units and provides a schematic representation of the fit. Ideal for engineers and designers working with precision components.

**Highlights:** ANSI standard limits and fits calculation, Supports inch units, Calculates tolerances for inner and outer features, Handles various fit types (RC, LC, LT, LN, FN), Schematic representation of fits, Applicable to non-threaded cylindrical parts

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### mechanical design engine

[App page](https://appshunter.io/ios/app/mechanical-design-engine/id1574341437)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Fit Tolerance ANSI free?

Fit Tolerance ANSI is free to download, with no in-app purchases.

### Is mechanical design engine free?

mechanical design engine is free to download, with no in-app purchases.

### Do Fit Tolerance ANSI or mechanical design engine have ads?

Fit Tolerance ANSI shows ads; mechanical design engine does not.

### Which is updated more often, Fit Tolerance ANSI or mechanical design engine?

Fit Tolerance ANSI ships an update every 9 months, and mechanical design engine every 2 months. Most recently, Fit Tolerance ANSI was updated on November 3, 2026 and mechanical design engine on October 27, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*