# trex Digital Manufacturing vs Engineering Calculator

The clearest difference is price: trex Digital Manufacturing at Free against Engineering Calculator's $0.99. trex Digital Manufacturing also leads on iOS requirement (13.0 vs 15.1). Engineering Calculator's advantage is update cadence (every 2 days vs every 5 weeks) and chart position (#197 vs unranked). On ads, in-app purchases and device support there is nothing between them.

trex Digital Manufacturing is free to download; Engineering Calculator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

trex Digital Manufacturing ships an update every 5 weeks, Engineering Calculator every 2 days. The most recent releases landed on September 17, 2026 and September 16, 2026 respectively.

## The numbers

| Metric | trex Digital Manufacturing | Engineering Calculator |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 days** |
| Best chart rank | — | **#197** |
| Size | 68 MB | 21 MB |
| Requires iOS | **13.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [TREX DIJITAL AKILLI URETIM SISTEMLERI ANONIM SIRKETI](https://appshunter.io/developer/875275078) | [Yasin Demir](https://appshunter.io/developer/1838444361) |

## What reviewers say

### trex Digital Manufacturing

[App page](https://appshunter.io/ios/app/trex-digital-manufacturing/id6748307002)

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

**In-app purchases:** none


### Engineering Calculator

[App page](https://appshunter.io/ios/app/engineering-calculator/id6761010498)

**Currently charting:** #197 Top Paid · Productivity (US App Store)

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

**In-app purchases:** none


## Frequently asked questions

### Is trex Digital Manufacturing free?

trex Digital Manufacturing is free to download, with no in-app purchases.

### Is Engineering Calculator free?

Engineering Calculator costs $0.99, with no in-app purchases.

### Do trex Digital Manufacturing or Engineering Calculator have ads?

Neither trex Digital Manufacturing nor Engineering Calculator shows ads.

### Which is updated more often, trex Digital Manufacturing or Engineering Calculator?

trex Digital Manufacturing ships an update every 5 weeks, and Engineering Calculator every 2 days. Most recently, trex Digital Manufacturing was updated on September 17, 2026 and Engineering Calculator on September 16, 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.*