# R47 RPN Calculator vs StackCalc Calculator

The clearest difference is in-app purchases: StackCalc Calculator at none against R47 RPN Calculator's 1. R47 RPN Calculator's advantage is update cadence (every 3 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. R47 RPN Calculator sells 1 one-off in-app purchase. StackCalc Calculator asks for nothing beyond the download.

R47 RPN Calculator ships an update every 3 days, StackCalc Calculator every 2 months. The most recent releases landed on October 31, 2026 and November 10, 2026 respectively.

## The numbers

| Metric | R47 RPN Calculator | StackCalc Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (29 ratings)](https://appshunter.io/ios/app/r47-rpn-calculator/id6763615664/reviews)** | — |
| Number of ratings | **29** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 2 months |
| Monetization | Freemium | — |
| Size | 63 MB | 102 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [MARCEL DAN](https://appshunter.io/developer/1895318613) | [Abraham Bagherjeiran](https://appshunter.io/developer/1513861366) |

## What reviewers say

### 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 |


### StackCalc Calculator

[App page](https://appshunter.io/ios/app/stackcalc-calculator/id6801788040)

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is R47 RPN Calculator free?

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

### Is StackCalc Calculator free?

StackCalc Calculator is free to download, with no in-app purchases.

### Do R47 RPN Calculator or StackCalc Calculator have ads?

Neither R47 RPN Calculator nor StackCalc Calculator shows ads.

### Which is updated more often, R47 RPN Calculator or StackCalc Calculator?

R47 RPN Calculator ships an update every 3 days, and StackCalc Calculator every 2 months. Most recently, R47 RPN Calculator was updated on October 31, 2026 and StackCalc Calculator on November 10, 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.*