# Stackis RPN — RPN Calculator

> RPN calculator with duodecimal support, inspired by classic models. (iPhone/iPad app by Skimra.)

- Source: https://appshunter.io/ios/app/stackis-rpn/id6752929114 (this page in markdown: same URL + `.md`)
- Developer: [Skimra](https://appshunter.io/developer/403502071)
- Category: Utilities, Education
- Price: Free with in-app purchases (on sale, was $0.99)
- Rating: 5.00/5 from 2 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 17.6 · 10 MB
- Languages: English
- Released: 2025-09-27
- Data updated: 2026-06-02
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/stackis-rpn/id6752929114/reviews.md

## What is Stackis RPN?

This is an RPN calculator in the style of, for instance, old HP models. It will feel familiar if you are used to RPN, otherwise it will probably be a little confusing at first. 

It's not programmable and it doesn't try to mimic older hardware; it's just meant to be a pleasant calculator for those who prefer to use RPN. 

Also, if you want to perform calculations in duodecimal (dozenal), this app is for you!

## Key features

- RPN calculation style
- Duodecimal (dozenal) support
- Familiar interface for RPN users
- Simple and pleasant user experience

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Advanced Mode | $1.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/stackis-rpn/id6752929114/reviews.md

### 5/5 — wow

*2025-11-16*

absolutely the best

## Frequently asked questions about Stackis RPN

### What is Stackis RPN?

Stackis RPN is a calculator application designed with Reverse Polish Notation (RPN) input, similar to older HP models. It also supports calculations in the duodecimal (dozenal) number system.

### Is Stackis RPN free to use?

Yes, Stackis RPN is available for free. There are no in-app purchases or advertisements within the application.

### What devices does Stackis RPN support?

Stackis RPN is currently supported on iPhone and iPod devices.

### How often is Stackis RPN updated?

The application was last updated on May 4, 2026, indicating active development and maintenance by the developer.

### What is the age rating for Stackis RPN?

Stackis RPN has an age rating of 4+, making it suitable for a wide range of users.

### Does Stackis RPN have ads?

No, Stackis RPN is ad-free. Users can perform calculations without interruption from advertisements.

### What is the user sentiment for Stackis RPN?

Based on the available data, Stackis RPN has received a perfect 5.0-star rating from 2 users, suggesting a very positive user experience.

### Can Stackis RPN be programmed?

No, Stackis RPN is not a programmable calculator and does not attempt to mimic older hardware interfaces beyond its RPN functionality.

## Version history (last 5 releases)

### 1.3.1 — 2026-05-04

Fixed a couple of bugs, plus it now allows typing of decimal numbers starting with the decimal point.

### 1.1 — 2025-10-09

Bug fixes, better visual feedback.

### 1.0.3 — 2025-10-06

Changed the scroll down function to roll the stack instead of discarding values (i.e. the previously popped value will be reinserted, instead of being thrown away.)

### 1.0.2 — 2025-10-01

Bug fixes

### 1.0.1 — 2025-09-28

Bug fixes

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## More apps by Skimra

- [Word Cup](https://appshunter.io/ios/app/word-cup/id403502067)

All apps by Skimra: https://appshunter.io/developer/403502071

## Related topics

[modern rpn](https://appshunter.io/ios/topics/modern-rpn)

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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 2026-06-02.*