# Learn Objective C Programming vs R47 RPN Calculator

The clearest difference is price: R47 RPN Calculator at Free against Learn Objective C Programming's $1.99. R47 RPN Calculator also leads on update cadence (every 3 days vs every 20 months). Learn Objective C Programming's advantage is in-app purchases (none vs 1) and iOS requirement (13.0 vs 15.6). On ads and device support there is nothing between them.

R47 RPN Calculator is free to download; Learn Objective C Programming costs $1.99 up front. R47 RPN Calculator sells 1 one-off in-app purchase. Learn Objective C Programming asks for nothing beyond the download.

Learn Objective C Programming ships an update every 20 months, R47 RPN Calculator every 3 days. The most recent releases landed on September 13, 2026 and September 20, 2026 respectively.

## The numbers

| Metric | Learn Objective C Programming | R47 RPN Calculator |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | — | **[5.0 (23 ratings)](https://appshunter.io/ios/app/r47-rpn-calculator/id6763615664/reviews)** |
| Number of ratings | — | **23** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 3 days** |
| Monetization | — | Freemium |
| Size | 35 MB | 61 MB |
| Requires iOS | **13.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Muhammad Mubeen](https://appshunter.io/developer/1553722821) | [MARCEL DAN](https://appshunter.io/developer/1895318613) |

## What reviewers say

### Learn Objective C Programming

[App page](https://appshunter.io/ios/app/learn-objective-c-programming/id6738732599)

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

**In-app purchases:** none


### R47 RPN Calculator

[App page](https://appshunter.io/ios/app/r47-rpn-calculator/id6763615664)

This scientific calculator uses Reverse Polish Notation (RPN) to help you break down complex problems. It offers a full 47-series instruction set with advanced functions and a program editor. The free version includes extensive tutorials and documentation.

**Highlights:** RPN scientific calculator, 47-series instruction set, Program editor, Tutorial library, Offline functionality, Light and dark themes

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Pack | $4.99 | one-time |


## Frequently asked questions

### Is Learn Objective C Programming free?

Learn Objective C Programming costs $1.99, with no in-app purchases.

### Is R47 RPN Calculator free?

R47 RPN Calculator is free to download, with in-app purchases available.

### Do Learn Objective C Programming or R47 RPN Calculator have ads?

Neither Learn Objective C Programming nor R47 RPN Calculator shows ads.

### Which is updated more often, Learn Objective C Programming or R47 RPN Calculator?

Learn Objective C Programming ships an update every 20 months, and R47 RPN Calculator every 3 days. Most recently, Learn Objective C Programming was updated on September 13, 2026 and R47 RPN Calculator on September 20, 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.*