# RPN vs Document Scanner & PDF Scanner

The clearest difference is price: Document Scanner & PDF Scanner at Free against RPN's $1.99. Document Scanner & PDF Scanner also leads on update cadence (every 2 weeks vs every 6 months). RPN's advantage is in-app purchases (none vs 2) and ads (none vs shown). On device support there is nothing between them.

Document Scanner & PDF Scanner is free to download; RPN costs $1.99 up front. Document Scanner & PDF Scanner sells 2 in-app purchases, starting at $0.99 per month. RPN asks for nothing beyond the download.

RPN ships an update every 6 months, Document Scanner & PDF Scanner every 2 weeks. The most recent releases landed on October 26, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | RPN | Document Scanner & PDF Scanner |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | **[4.4 (14 ratings)](https://appshunter.io/ios/app/rpn-35-sd/id956224485/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 71.4% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 6 months | **Every 2 weeks** |
| Monetization | Paid | — |
| Size | 14 MB | 96 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CuVee Software](https://appshunter.io/developer/424873503) | [Identiq Infotech](https://appshunter.io/developer/1881019162) |

## What reviewers say

### RPN

[App page](https://appshunter.io/ios/app/rpn-35-sd/id956224485)

This app emulates the first pocket scientific calculator, offering a photo-realistic vintage experience. It simulates original operating speeds and unique arithmetic bugs, with optional modern enhancements like non-volatile registers.

**Highlights:** Photo-realistic look-and-feel, Multiple vintage skins, Vintage and Enhanced modes, Optional key-click and key-glow, Swipe to correct input, Display stack and memory registers

**Features:** macOS Compatibility

**In-app purchases:** none


### Document Scanner & PDF Scanner

[App page](https://appshunter.io/ios/app/document-scanner-and-pdf-scanner/id6756054579)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $0.99 | per month |
| Premium Yearly | $9.99 | per year |


## Frequently asked questions

### Is RPN free?

RPN costs $1.99, with no in-app purchases.

### Is Document Scanner & PDF Scanner free?

Document Scanner & PDF Scanner is free to download, with in-app purchases available.

### Do RPN or Document Scanner & PDF Scanner have ads?

Document Scanner & PDF Scanner shows ads; RPN does not.

### Which is updated more often, RPN or Document Scanner & PDF Scanner?

RPN ships an update every 6 months, and Document Scanner & PDF Scanner every 2 weeks. Most recently, RPN was updated on October 26, 2026 and Document Scanner & PDF Scanner on October 13, 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.*