# RPN vs View Selection Source

The clearest difference is update cadence: RPN at every 3 months against View Selection Source's every 42 months. View Selection Source's advantage is price ($0.99 vs $3.99). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

RPN costs $3.99 and View Selection Source $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

RPN ships an update every 3 months, View Selection Source every 42 months. The most recent releases landed on September 21, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | RPN | View Selection Source |
| --- | --- | --- |
| Price | $3.99 | **$0.99** |
| Rating | **[4.6 (17 ratings)](https://appshunter.io/ios/app/rpn-67-sd/id1109722386/reviews)** | — |
| Number of ratings | **17** | — |
| Positive reviews | 92.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 42 months |
| Monetization | Paid | — |
| Size | 63 MB | 76 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [CuVee Software](https://appshunter.io/developer/424873503) | [Huong Nguyen](https://appshunter.io/developer/1342162705) |

## What reviewers say

### RPN

[App page](https://appshunter.io/ios/app/rpn-67-sd/id1109722386)

This app simulates a vintage programmable calculator from the mid-70s, offering enhanced features beyond the original. It allows users to run existing programs, manage virtual cards, and utilize advanced functions for scientific and engineering tasks.

**Highlights:** Virtual program and data cards, Virtual paper tape printer, Database-driven card manager, Create, label, and organize unlimited cards, Share cards via email, AirDrop, Dropbox, Editable program listings, Enhanced features for more program steps and registers

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

**In-app purchases:** none


### View Selection Source

[App page](https://appshunter.io/ios/app/view-selection-source/id1382143618)

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

**In-app purchases:** none


## Frequently asked questions

### Is RPN free?

RPN costs $3.99, with no in-app purchases.

### Is View Selection Source free?

View Selection Source costs $0.99, with no in-app purchases.

### Do RPN or View Selection Source have ads?

Neither RPN nor View Selection Source shows ads.

### Which is updated more often, RPN or View Selection Source?

RPN ships an update every 3 months, and View Selection Source every 42 months. Most recently, RPN was updated on September 21, 2026 and View Selection Source on September 11, 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.*