# Fit Tolerance ISO Pro vs Mechanical Toolkit

The clearest difference is price: Mechanical Toolkit at Free against Fit Tolerance ISO Pro's $0.99. Mechanical Toolkit also leads on iOS requirement (13.0 vs 15.0). Fit Tolerance ISO Pro's advantage is in-app purchases (none vs 1). On update cadence, ads and device support there is nothing between them.

Mechanical Toolkit is free to download; Fit Tolerance ISO Pro costs $0.99 up front. Mechanical Toolkit sells 1 one-off in-app purchase. Fit Tolerance ISO Pro asks for nothing beyond the download.

Fit Tolerance ISO Pro ships an update every 12 months, Mechanical Toolkit every 20 months. The most recent releases landed on November 2, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Fit Tolerance ISO Pro | Mechanical Toolkit |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fit-tolerance-iso-pro/id1397159146/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 12 months** | Every 20 months |
| Monetization | Paid | — |
| Size | 47 MB | 49 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Yasar Yucel Yesilbag](https://appshunter.io/developer/1251895011) | [Shital Gorasiya](https://appshunter.io/developer/1737199158) |

## What reviewers say

### Fit Tolerance ISO Pro

[App page](https://appshunter.io/ios/app/fit-tolerance-iso-pro/id1397159146)

Calculate engineering tolerances for various mechanical components like bearings, shafts, and housings. It adheres to ISO and ANSI standards, providing size limits, deviations, and fit types. Visual representations of fits are also generated.

**Highlights:** Calculate engineering tolerances, Supports ISO and ANSI standards, Determines clearance, transition, and interference fits, Provides schematic fit representations, Includes preferred tolerances and fits, Calculates size limits and deviations

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

**In-app purchases:** none


### Mechanical Toolkit

[App page](https://appshunter.io/ios/app/mechanical-toolkit/id6480299808)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Purchase | $4.99 | one-time |


## Frequently asked questions

### Is Fit Tolerance ISO Pro free?

Fit Tolerance ISO Pro costs $0.99, with no in-app purchases.

### Is Mechanical Toolkit free?

Mechanical Toolkit is free to download, with in-app purchases available.

### Do Fit Tolerance ISO Pro or Mechanical Toolkit have ads?

Neither Fit Tolerance ISO Pro nor Mechanical Toolkit shows ads.

### Which is updated more often, Fit Tolerance ISO Pro or Mechanical Toolkit?

Fit Tolerance ISO Pro ships an update every 12 months, and Mechanical Toolkit every 20 months. Most recently, Fit Tolerance ISO Pro was updated on November 2, 2026 and Mechanical Toolkit on November 4, 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.*