# Mechanical Engineering Toolkit vs Poly

The clearest difference is price: Mechanical Engineering Toolkit at Free against Poly's $2.99. Mechanical Engineering Toolkit also leads on update cadence (every 5 days vs every 2 weeks) and device support (4 vs 2). Poly's advantage is in-app purchases (none vs 1) and ads (none vs shown).

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

Mechanical Engineering Toolkit ships an update every 5 days, Poly every 2 weeks. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | Mechanical Engineering Toolkit | Poly |
| --- | --- | --- |
| 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 | **Every 5 days** | Every 2 weeks |
| Monetization | Free with in-app purchases | — |
| Size | 47 MB | 24 MB |
| Requires iOS | **15.0** | 17.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [APPS BAY LIMITED](https://appshunter.io/developer/1599035519) | [German Alfonso Torres](https://appshunter.io/developer/6778190899) |

## What reviewers say

### Mechanical Engineering Toolkit

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

This professional engineering calculator provides instant results for students, researchers, and practicing engineers. It offers detailed calculation steps, formulas, diagrams, and unit conversions. Save inputs as projects and export results in various formats.

**Highlights:** Engineering equations and formulas, Step-by-step calculation breakdowns, SI and Imperial unit conversions, Save and export results (text, image, CSV, PDF), Offline functionality, Extensive library of engineering tools

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases (1)**

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


### Poly

[App page](https://appshunter.io/ios/app/poly-pdf/id6786144065)

**Features:** Vision Pro support

**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 Poly free?

Poly costs $2.99, with no in-app purchases.

### Do Mechanical Engineering Toolkit or Poly have ads?

Mechanical Engineering Toolkit shows ads; Poly does not.

### Which is updated more often, Mechanical Engineering Toolkit or Poly?

Mechanical Engineering Toolkit ships an update every 5 days, and Poly every 2 weeks. Most recently, Mechanical Engineering Toolkit was updated on October 30, 2026 and Poly on October 31, 2026.

---

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