# RPN Calc vs RPN

The clearest difference is price: RPN at Free against RPN Calc's $0.99. RPN also leads on update cadence (monthly vs every 3 months). RPN Calc's advantage is review sentiment (38% vs 0%) and in-app purchases (none vs 1). On ads, monetization model and iOS requirement there is nothing between them.

RPN is free to download; RPN Calc costs $0.99 up front. RPN sells 1 one-off in-app purchase. RPN Calc asks for nothing beyond the download.

RPN Calc ships an update every 3 months, RPN monthly. The most recent releases landed on October 31, 2026 and November 1, 2026 respectively.

## The numbers

| Metric | RPN Calc | RPN |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.0 (6 ratings)](https://appshunter.io/ios/app/rpn-calc/id285002799/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | **37.9% of reviews** | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Monthly** |
| Monetization | Free | Free |
| Size | 3 MB | 5 MB |
| Requires iOS | **16.0** | 16.6 |
| Devices | **iPhone, iPad, Apple Watch** | iPhone |
| Age rating | +4 | 4+ |
| Developer | [James Mattis](https://appshunter.io/developer/285002802) | [Tomas Stankiewicz Baldassarri](https://appshunter.io/developer/452519243) |

## What reviewers say

### RPN Calc

[App page](https://appshunter.io/ios/app/rpn-calc/id285002799)

This app provides a straightforward reverse Polish notation (RPN) calculator experience, inspired by classic HP models. It offers a clean interface with large buttons for quick calculations on iPhone, iPad, and Apple Watch, along with a convenient Today Extension for immediate access.

**Highlights:** Reverse Polish Notation (RPN) input, Clean, simple interface, Large, easy-to-press buttons, iPhone, iPad, and Apple Watch support, Today Extension for quick access

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

**In-app purchases:** none


### RPN

[App page](https://appshunter.io/ios/app/rpn/id452519240)

This utility app functions as a reverse Polish notation calculator. Users input numbers and operations using a stack-based interface to perform calculations. It's designed for straightforward mathematical tasks.

**Highlights:** Reverse Polish Notation (RPN) input, Stack-based operation, Intuitive digit and operation buttons, Clear result display

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Stack LCD | $0.49 | one-time |


## Frequently asked questions

### Is RPN Calc free?

RPN Calc costs $0.99, with no in-app purchases.

### Is RPN free?

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

### Do RPN Calc or RPN have ads?

Neither RPN Calc nor RPN shows ads.

### Which is updated more often, RPN Calc or RPN?

RPN Calc ships an update every 3 months, and RPN monthly. Most recently, RPN Calc was updated on October 31, 2026 and RPN on November 1, 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.*