# Engineer's Unit Converter vs RPN Deck

The clearest difference is ads: RPN Deck at none against Engineer's Unit Converter's shown. RPN Deck also leads on update cadence (every 11 days vs monthly). On price, in-app purchases, device support and iOS requirement there is nothing between them.

Both are free to download. Engineer's Unit Converter sells 1 one-off in-app purchase and RPN Deck sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Engineer's Unit Converter ships an update monthly, RPN Deck every 11 days. Both last shipped on October 15, 2026.

## The numbers

| Metric | Engineer's Unit Converter | RPN Deck |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 11 days** |
| Size | 7 MB | 2 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Jose Gerardo Palma Duran](https://appshunter.io/developer/1873843788) | [Edgard Leo Berendsen Mercado](https://appshunter.io/developer/1893604343) |

## 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 |


### RPN Deck

[App page](https://appshunter.io/ios/app/rpn-deck/id6796490842)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Deck | $2.99 | one-time |


## Frequently asked questions

### Is Engineer's Unit Converter free?

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

### Is RPN Deck free?

RPN Deck is free to download, with in-app purchases available.

### Do Engineer's Unit Converter or RPN Deck have ads?

Engineer's Unit Converter shows ads; RPN Deck does not.

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

Engineer's Unit Converter ships an update monthly, and RPN Deck every 11 days. Most recently, Engineer's Unit Converter was updated on October 15, 2026 and RPN Deck on October 15, 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.*