# Engineer's Unit Converter vs PlantCalculator

The clearest difference is in-app purchases: PlantCalculator at none against Engineer's Unit Converter's 1. PlantCalculator also leads on update cadence (every 9 days vs monthly) and iOS requirement (13.0 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Engineer's Unit Converter sells 1 one-off in-app purchase. PlantCalculator asks for nothing beyond the download.

Engineer's Unit Converter ships an update monthly, PlantCalculator every 9 days. Both last shipped on October 31, 2026.

## The numbers

| Metric | Engineer's Unit Converter | PlantCalculator |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | Yes | Yes |
| Update frequency | Monthly | **Every 9 days** |
| Size | 7 MB | 25 MB |
| Requires iOS | 18.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jose Gerardo Palma Duran](https://appshunter.io/developer/1873843788) | [Ryo Iida](https://appshunter.io/developer/1852269856) |

## What reviewers say

### Engineer's Unit Converter

[App page](https://appshunter.io/ios/app/engineers-unit-converter/id6758744042)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


### PlantCalculator

[App page](https://appshunter.io/ios/app/plantcalculator/id6782103531)

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

**In-app purchases:** none


## Frequently asked questions

### Is Engineer's Unit Converter free?

Engineer's Unit Converter is free to download, with in-app purchases available.

### Is PlantCalculator free?

PlantCalculator is free to download, with no in-app purchases.

### Do Engineer's Unit Converter or PlantCalculator have ads?

Both Engineer's Unit Converter and PlantCalculator show ads.

### Which is updated more often, Engineer's Unit Converter or PlantCalculator?

Engineer's Unit Converter ships an update monthly, and PlantCalculator every 9 days. Most recently, Engineer's Unit Converter was updated on October 31, 2026 and PlantCalculator on October 31, 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.*