# RPN vs PDF Flatten

The clearest difference is chart position: PDF Flatten at #198 against RPN's unranked. PDF Flatten also leads on price ($0.99 vs $1.99). RPN's advantage is iOS requirement (12.0 vs 15.1). On ads, in-app purchases and device support there is nothing between them.

RPN costs $1.99 and PDF Flatten $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | RPN | PDF Flatten |
| --- | --- | --- |
| Price | $1.99 | **$0.99** |
| 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 | No |
| Ads | No | No |
| Update frequency | Every 6 months | — |
| Monetization | Paid | — |
| Best chart rank | — | **#198** |
| Size | 14 MB | 29 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [CuVee Software](https://appshunter.io/developer/424873503) | [StudyBridge LLC](https://appshunter.io/developer/1830101876) |

## 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


### PDF Flatten

[App page](https://appshunter.io/ios/app/pdf-flatten/id6759459284)

**Currently charting:** #198 Top Paid · Productivity (US App Store)

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

**In-app purchases:** none


## Frequently asked questions

### Is RPN free?

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

### Is PDF Flatten free?

PDF Flatten costs $0.99, with no in-app purchases.

### Do RPN or PDF Flatten have ads?

Neither RPN nor PDF Flatten shows ads.

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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.*