# Unit Converter Pro Calculator vs ECA 3D

The clearest difference is ads: ECA 3D at none against Unit Converter Pro Calculator's shown. Unit Converter Pro Calculator's advantage is update cadence (every 3 weeks vs every 19 months). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Unit Converter Pro Calculator ships an update every 3 weeks, ECA 3D every 19 months. The most recent releases landed on November 3, 2026 and November 4, 2026 respectively.

## The numbers

| Metric | Unit Converter Pro Calculator | ECA 3D |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 3 weeks** | Every 19 months |
| Size | 32 MB | 27 MB |
| Requires iOS | 13.0 | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Barnasoba, S.L.](https://appshunter.io/developer/1823395954) | [Evoltech Srl](https://appshunter.io/developer/1759414077) |

## What reviewers say

### Unit Converter Pro Calculator

[App page](https://appshunter.io/ios/app/unit-converter-pro-calculator/id1488398127)

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

**In-app purchases:** none


### ECA 3D

[App page](https://appshunter.io/ios/app/eca-3d/id6624305508)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Unit Converter Pro Calculator free?

Unit Converter Pro Calculator is free to download, with no in-app purchases.

### Is ECA 3D free?

ECA 3D is free to download, with no in-app purchases.

### Do Unit Converter Pro Calculator or ECA 3D have ads?

Unit Converter Pro Calculator shows ads; ECA 3D does not.

### Which is updated more often, Unit Converter Pro Calculator or ECA 3D?

Unit Converter Pro Calculator ships an update every 3 weeks, and ECA 3D every 19 months. Most recently, Unit Converter Pro Calculator was updated on November 3, 2026 and ECA 3D on November 4, 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.*