# Fit Tolerance ISO vs Mechanical Engineering Toolkit

The clearest difference is in-app purchases: Fit Tolerance ISO at none against Mechanical Engineering Toolkit's 1. Fit Tolerance ISO also leads on rating (5.0 vs 4.8). Mechanical Engineering Toolkit's advantage is update cadence (weekly vs every 12 months) and ratings volume (64 vs 2). On price, ads, monetization model and device support there is nothing between them.

Both are free to download. Mechanical Engineering Toolkit sells 1 one-off in-app purchase. Fit Tolerance ISO asks for nothing beyond the download.

Fit Tolerance ISO holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Mechanical Engineering Toolkit has 64 ratings behind it against 2, so its average is the more settled of the two.

Fit Tolerance ISO ships an update every 12 months, Mechanical Engineering Toolkit weekly. The most recent releases landed on October 12, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Fit Tolerance ISO | Mechanical Engineering Toolkit |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/fit-tolerance-iso/id1251895012/reviews)** | [4.8 (64 ratings)](https://appshunter.io/ios/app/mechanical-engineering-toolkit/id1601099443/reviews) |
| Number of ratings | 2 | **64** |
| Positive reviews | — | 57.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 12 months | **Weekly** |
| Monetization | Ad-supported | Ad-supported |
| Size | 51 MB | 43 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 4+ |
| Developer | [Yasar Yucel Yesilbag](https://appshunter.io/developer/1251895011) | [APPS BAY LIMITED](https://appshunter.io/developer/1599035519) |

## What reviewers say

### Fit Tolerance ISO

[App page](https://appshunter.io/ios/app/fit-tolerance-iso/id1251895012)

Calculates engineering tolerances for various mechanical components based on ISO and ANSI standards. It determines size limits, deviations, and fit types for holes and shafts, offering schematic representations of fits.

**Highlights:** Calculates engineering tolerances, Supports ISO and ANSI standards, Determines clearance, transition, and interference fits, Provides schematic fit representations, Includes preferred tolerances and fits, Works with metric units

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

**In-app purchases:** none


### Mechanical Engineering Toolkit

[App page](https://appshunter.io/ios/app/mechanical-engineering-toolkit/id1601099443)

This utility app provides a comprehensive collection of engineering equations and formulas for students and professionals. Easily perform calculations by selecting a formula and inputting variables, with detailed instructions and reference material included.

**Highlights:** Engineering equations and formulas, Mechanics of Material calculations, Theory of Elasticity formulas, Composite Material properties, Reference material, Variable input for calculations

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $2.99 | one-time |


## Frequently asked questions

### Is Fit Tolerance ISO free?

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

### Is Mechanical Engineering Toolkit free?

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

### Which has better reviews, Fit Tolerance ISO or Mechanical Engineering Toolkit?

Fit Tolerance ISO is rated higher. Fit Tolerance ISO averages 5.0 out of 5 from 2 ratings, while Mechanical Engineering Toolkit averages 4.8 from 64 ratings.

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

Both Fit Tolerance ISO and Mechanical Engineering Toolkit show ads.

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

Fit Tolerance ISO ships an update every 12 months, and Mechanical Engineering Toolkit weekly. Most recently, Fit Tolerance ISO was updated on October 12, 2026 and Mechanical Engineering Toolkit on October 16, 2026.

---

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