# CORE Calculator App vs mechanical design engine

The clearest difference is in-app purchases: mechanical design engine at none against CORE Calculator App's 2. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. CORE Calculator App sells 2 in-app purchases, starting at $4.99 per month. mechanical design engine asks for nothing beyond the download.

CORE Calculator App ships an update every 3 months, mechanical design engine every 2 months. The most recent releases landed on November 2, 2026 and November 11, 2026 respectively.

## The numbers

| Metric | CORE Calculator App | mechanical design engine |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (11 ratings)](https://appshunter.io/ios/app/core-calculator-app/id1447118499/reviews)** | — |
| Number of ratings | **11** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free with in-app purchases | — |
| Size | 148 MB | 63 MB |
| Requires iOS | 14.0 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [AsInt Inc.](https://appshunter.io/developer/1438397626) | [gan dae choi](https://appshunter.io/developer/1574341439) |

## What reviewers say

### CORE Calculator App

[App page](https://appshunter.io/ios/app/core-calculator-app/id1447118499)

This app provides inspectors in the oil and gas industry with essential calculations for asset integrity. It offers tools for determining Tmin, MAWP, corrosion rates, and remaining life based on industry standards.

**Highlights:** Tmin calculations, MAWP calculations, Corrosion rate calculations, Remaining life determination, Construction material information, Damage mechanism identification

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Materials Lookup | $4.99 | per month |
| Damage Mech Screener | $9.99 | per month |


### mechanical design engine

[App page](https://appshunter.io/ios/app/mechanical-design-engine/id1574341437)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CORE Calculator App free?

CORE Calculator App is free to download, with in-app purchases available.

### Is mechanical design engine free?

mechanical design engine is free to download, with no in-app purchases.

### Do CORE Calculator App or mechanical design engine have ads?

Neither CORE Calculator App nor mechanical design engine shows ads.

### Which is updated more often, CORE Calculator App or mechanical design engine?

CORE Calculator App ships an update every 3 months, and mechanical design engine every 2 months. Most recently, CORE Calculator App was updated on November 2, 2026 and mechanical design engine on November 11, 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.*