# RPN — Simple RPN Calculator

> A simple reverse Polish notation (RPN) calculator for performing mathematical operations. (iPhone/iPad app by Tomas Stankiewicz Baldassarri.)

- Source: https://appshunter.io/ios/app/rpn/id452519240 (this page in markdown: same URL + `.md`)
- Developer: [Tomas Stankiewicz Baldassarri](https://appshunter.io/developer/452519243)
- Category: Utilities, Education
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 16.6 · 3 MB
- Languages: American English, Italian
- Released: 2011-10-12
- Data updated: 2026-07-23
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/rpn/id452519240/reviews.md

## What is RPN?

Simple reverse polish notation calculator.

To make an operation you tap the number using the digit buttons.
When you want to insert the number into the stack you press the orange button "Enter".
When you're done inserting the numbers just tap the operation to do it.
The result will be displayed  but not put again into stack.

Example: 

 6+7  is  6 enter, 7 enter +

## Key features

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

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

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


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/rpn/id452519240/reviews.md

### 1/5 — Doesn't calculate correctly

*2013-12-26*

I was looking for a basic, fast loading, RPN calculator.  This one looks nice, but doesn't give correct results, or is not responsive to key presses.

## Frequently asked questions about RPN

### How do I perform an operation in RPN?

To perform an operation, first tap the numbers using the digit buttons. Press the orange 'Enter' button to insert each number into the stack. Once all numbers are entered, tap the desired operation button to execute it. The result will be displayed but not automatically added back to the stack.

### What is reverse Polish notation (RPN)?

Reverse Polish Notation (RPN) is a mathematical notation where every operator follows all of its operands. This means you enter numbers first, then the operation, which can simplify complex calculations for some users.

### Is RPN suitable for complex calculations?

RPN can be very efficient for complex calculations once you are familiar with the notation. It eliminates the need for parentheses and can streamline the input process for multi-step equations.

### What devices is RPN available on?

RPN is available on devices compatible with Android. The specific version is 1.3, and it was last updated on June 19, 2026.

### What is the age rating for RPN?

RPN has an age rating of 4+, making it suitable for a wide range of users, including younger individuals learning basic arithmetic.

### How often is RPN updated?

The latest version of RPN is 1.3, and it was last updated on June 19, 2026. While specific update frequency isn't detailed, this indicates recent development.

### Does RPN have ads?

The provided data does not specify if RPN contains advertisements. However, it is listed as free with no in-app purchases, suggesting a potentially ad-free experience.

## Version history (last 5 releases)

### 1.3.1 — 2026-07-16

bug fixes.

### 1.3 — 2026-06-19

Added Stack LCD with In App Purchase.

### 1.2 — 2026-06-10

Code update to support lates devices and iOS version.

### 1.1 — 2013-09-12

- iOS 7 support
- 4" screen support

### 1.0 — 2011-10-09

No release notes.

## More apps by Tomas Stankiewicz Baldassarri

- [bitSnake](https://appshunter.io/ios/app/bitsnake/id509845021)
- [Japanese OCR](https://appshunter.io/ios/app/japanese-ocr/id6784787587)

All apps by Tomas Stankiewicz Baldassarri: https://appshunter.io/developer/452519243

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-23.*