# Mechanical Engineer vs Polycorp Material Calculator

The clearest difference is in-app purchases: Polycorp Material Calculator at none against Mechanical Engineer's 3. Polycorp Material Calculator also leads on iOS requirement (12.3 vs 17.6). Mechanical Engineer's advantage is update cadence (every 2 months vs every 10 months). On price, ads and device support there is nothing between them.

Both are free to download. Mechanical Engineer sells 3 in-app purchases, starting at $0.99 per month. Polycorp Material Calculator asks for nothing beyond the download.

Mechanical Engineer ships an update every 2 months, Polycorp Material Calculator every 10 months. The most recent releases landed on September 26, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Mechanical Engineer | Polycorp Material Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.4 (8 ratings)](https://appshunter.io/ios/app/mechanical-engineer/id327055140/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 30.8% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 2 months** | Every 10 months |
| Monetization | Free with in-app purchases | — |
| Size | 5 MB | 22 MB |
| Requires iOS | 17.6 | **12.3** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Historycentral.com](https://appshunter.io/developer/1744330560) | [Avanaire Design, LLC](https://appshunter.io/developer/409628132) |

## What reviewers say

### Mechanical Engineer

[App page](https://appshunter.io/ios/app/mechanical-engineer/id327055140)

This app provides over 300 essential mechanical engineering formulas across various domains. It allows users to calculate, save, compare, and share results, aiding in project optimization and decision-making. Users can access a limited number of calculations for free, with a subscription unlocking full functionality.

**Highlights:** Over 300 mechanical engineering formulas, Covers diverse engineering domains, Save and compare formula results, Share calculation outcomes, Intuitive and practical interface, Regular updates based on user input

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly Subscription | $0.99 | per month |
| Pro Quarterly | $0.99 | per 3 months |
| Pro Yearly | $2.99 | per year |


### Polycorp Material Calculator

[App page](https://appshunter.io/ios/app/polycorp-material-calculator/id1027626460)

**In-app purchases:** none


## Frequently asked questions

### Is Mechanical Engineer free?

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

### Is Polycorp Material Calculator free?

Polycorp Material Calculator is free to download, with no in-app purchases.

### Do Mechanical Engineer or Polycorp Material Calculator have ads?

Neither Mechanical Engineer nor Polycorp Material Calculator shows ads.

### Which is updated more often, Mechanical Engineer or Polycorp Material Calculator?

Mechanical Engineer ships an update every 2 months, and Polycorp Material Calculator every 10 months. Most recently, Mechanical Engineer was updated on September 26, 2026 and Polycorp Material Calculator on September 28, 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.*