# RPN Calculator DeepStack

> Lightweight HP-style RPN calculator with optimized layout and deep stack. (iPhone/iPad app by Kanasyscom, Inc..)

- Source: https://appshunter.io/ios/app/rpn-calculator-deepstack/id952966287 (this page in markdown: same URL + `.md`)
- Developer: [Kanasyscom, Inc.](https://appshunter.io/developer/1304802717)
- Category: Utilities, Business
- Price: Free
- Age rating: 4+
- Requires: iOS 9.0 · 17 MB
- Languages: American English, Japanese
- Released: 2015-01-04
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/rpn-calculator-deepstack/id952966287/reviews.md

## What is RPN Calculator DeepStack?

Lightweight Optimized HP Style Reverse Polish Notation(RPN) Calculator.

Features:

- Optimized Key Layout
- Big Enter and Zero Key
- No Triangle Functions or 2nd Function key.
- Conditional DUP/DROP key(Enter/Backspace)
- Conditional E/E- key(Period)
- Right hand optimized design
- Paste from clipboard
- Copy to clipboard(Tap stack)

Additional features from lite version.

- Inverting layout for left hand using(Optional)
- Stack Label(Optional)
- Auto Sum(Optional)
- Shake to Reset(Optional)
- Auto Copy to Clipboard(Optional)

Infinity Stack

- Deep stack without limitation except memory capacity.
- Stateless Design, Reset all condition when launching.

Responsive Touch

- Simple UI response is quicker than rich UI or HP emulators.
- Click sound (2 pattern,numbers or others)

## Key features

- Optimized Key Layout
- Big Enter and Zero Key
- Conditional DUP/DROP and E/E- keys
- Paste and Copy to Clipboard
- Infinity Stack
- Responsive Touch UI
- Optional Left-Hand Layout

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/rpn-calculator-deepstack/id952966287/reviews.md

### 3/5 — Does not rotate

*2020-06-04*

This is a neat little app.

It's also pretty basic. But it's free, it's fast, it's easy on the eye, it has no advertising whatsoever, and it's easy to use…
–Except for one major drawback: most often, my iPad sits horizontally on a desk and with no landscape view available, I have to read it sideways.

## Frequently asked questions about RPN Calculator DeepStack

### What is RPN Calculator DeepStack?

RPN Calculator DeepStack is a free, lightweight calculator app that uses Reverse Polish Notation (RPN) for calculations. It is designed with an optimized layout similar to HP calculators for efficient input.

### Does RPN Calculator DeepStack have ads?

No, RPN Calculator DeepStack is ad-free. It provides a clean user experience without any advertisements interrupting your calculations.

### What devices does RPN Calculator DeepStack support?

RPN Calculator DeepStack is available for iPhone and iPod devices. It is designed to run on iOS.

### How often is RPN Calculator DeepStack updated?

The app was last updated on June 21, 2019, to version 1.5.0. While updates have not been frequent recently, the app is stable and functional for its core purpose.

### What is the age rating for RPN Calculator DeepStack?

RPN Calculator DeepStack has an age rating of 4+. This indicates it is suitable for users of all ages and does not contain any mature content.

### Can I customize the layout for left-handed use in RPN Calculator DeepStack?

Yes, RPN Calculator DeepStack offers an optional inverting layout for left-hand users. This feature can be enabled to better suit your dominant hand.

### Does RPN Calculator DeepStack have a free trial?

RPN Calculator DeepStack is completely free to download and use, so there is no need for a free trial. You can access all its core functionalities without any cost.

### What makes RPN Calculator DeepStack's UI responsive?

The app's UI is designed for simplicity and speed, responding quicker than more complex or graphically rich emulators. This ensures a smooth and efficient calculation experience.

## Version history (last 5 releases)

### 1.5.0 — 2019-06-21

Bugfix: (Number & Unary Operation) -> X disappear

### 1.4.3 — 2016-10-12

- New look
- Paste from clipboard(Extra Bar)
- Copy to clipboard(Tap stack)
- Bugfix: Issue of background music stops at key click.

### 1.4.2 — 2016-10-11

- New look
- Paste from clipboard(Extra Bar)
- Copy to clipboard(Tap stack)
- Bugfix: Issue of background music stops at key click.

### 1.4.1 — 2016-09-21

- Fixed wrong key name (x^y -> y^x)
- iOS10 supported

### 1.3.1 — 2016-01-08

- Fixed: Auto copy to clipboard was not working on some key.
- Fixed: Color of number was gray even if touching some key.
- Added: Silent mode

## Apps similar to RPN Calculator DeepStack

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [bcRPN](https://appshunter.io/ios/app/bcrpn/id1614744829) | 4.8 (4) | Free | Utilities |
| [Bluetooth Test Tool](https://appshunter.io/ios/app/bluetooth-test-tool/id1168343647) | — | Free | Utilities |
| [PO Contacts](https://appshunter.io/ios/app/po-contacts/id1495556759) | 5.0 (1) | Free | Utilities |
| [CompEx Telematix](https://appshunter.io/ios/app/compex-telematix/id1508383314) | — | Free | Utilities |
| [BHT Control](https://appshunter.io/ios/app/bht-control/id1035099188) | — | Free | Utilities |
| [Dozecal](https://appshunter.io/ios/app/dozecal/id1521160089) | 4.0 (4) | Free | Utilities |

## More apps by Kanasyscom, Inc.

- [DepenDo Reminder](https://appshunter.io/ios/app/dependo-reminder/id946969233)
- [Webバーコード価格比較](https://appshunter.io/ios/app/web/id950957808)
- [YA Messenger](https://appshunter.io/ios/app/ya-messenger/id954861066)
- [Free RPN Calculator DeepStackLite](https://appshunter.io/ios/app/free-rpn-calculator-deepstacklite/id1155991031)
- [Zoom In/Out/Shift Map by Speed-SpeedZoomap](https://appshunter.io/ios/app/zoom-inoutshift-map-by-speed-speedzoomap/id1161131169)

All apps by Kanasyscom, Inc.: https://appshunter.io/developer/1304802717

---

*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 2026-06-10.*