# Mechanical Engineering Toolkit vs PDF Studio(Pro)

The clearest difference is price: Mechanical Engineering Toolkit at Free against PDF Studio(Pro)'s $2.99. PDF Studio(Pro)'s advantage is in-app purchases (none vs 1) and ads (none vs shown). On device support there is nothing between them.

Mechanical Engineering Toolkit is free to download; PDF Studio(Pro) costs $2.99 up front. Mechanical Engineering Toolkit sells 1 one-off in-app purchase. PDF Studio(Pro) asks for nothing beyond the download.

Mechanical Engineering Toolkit ships an update weekly, PDF Studio(Pro) every 2 days. The most recent releases landed on October 15, 2026 and October 3, 2026 respectively.

## The numbers

| Metric | Mechanical Engineering Toolkit | PDF Studio(Pro) |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.8 (64 ratings)](https://appshunter.io/ios/app/mechanical-engineering-toolkit/id1601099443/reviews)** | — |
| Number of ratings | **64** | — |
| Positive reviews | 57.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Weekly | **Every 2 days** |
| Monetization | Ad-supported | — |
| Size | 43 MB | 42 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [APPS BAY LIMITED](https://appshunter.io/developer/1599035519) | [Hrishi Suthar](https://appshunter.io/developer/1660005858) |

## What reviewers say

### 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 |


### PDF Studio(Pro)

[App page](https://appshunter.io/ios/app/pdf-studiopro/id6757748809)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Mechanical Engineering Toolkit free?

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

### Is PDF Studio(Pro) free?

PDF Studio(Pro) costs $2.99, with no in-app purchases.

### Do Mechanical Engineering Toolkit or PDF Studio(Pro) have ads?

Mechanical Engineering Toolkit shows ads; PDF Studio(Pro) does not.

### Which is updated more often, Mechanical Engineering Toolkit or PDF Studio(Pro)?

Mechanical Engineering Toolkit ships an update weekly, and PDF Studio(Pro) every 2 days. Most recently, Mechanical Engineering Toolkit was updated on October 15, 2026 and PDF Studio(Pro) on October 3, 2026.

---

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