# RPN vs Octuple Calc

The clearest difference is in-app purchases: Octuple Calc at none against RPN's 1. Octuple Calc also leads on update cadence (every 2 weeks vs every 6 weeks) and device support (3 vs 1). RPN's advantage is ads (none vs shown). On price there is nothing between them.

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

RPN ships an update every 6 weeks, Octuple Calc every 2 weeks. The most recent releases landed on October 3, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | RPN | Octuple Calc |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 5 MB | 36 MB |
| Requires iOS | 17.0 | **15.8.3** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Tomas Stankiewicz Baldassarri](https://appshunter.io/developer/452519243) | [Hideaki Uchikoshi](https://appshunter.io/developer/1559575002) |

## What reviewers say

### 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 |


### Octuple Calc

[App page](https://appshunter.io/ios/app/octuple-calc/id6742039735)

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

**In-app purchases:** none


## Frequently asked questions

### Is RPN free?

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

### Is Octuple Calc free?

Octuple Calc is free to download, with no in-app purchases.

### Do RPN or Octuple Calc have ads?

Octuple Calc shows ads; RPN does not.

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

RPN ships an update every 6 weeks, and Octuple Calc every 2 weeks. Most recently, RPN was updated on October 3, 2026 and Octuple Calc on September 28, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*