# Simple RPN

> Simple RPN (iPhone/iPad app by Nicolas Augsburger Rossi.)

- Source: https://appshunter.io/ios/app/simple-rpn/id6771959257 (this page in markdown: same URL + `.md`)
- Developer: [Nicolas Augsburger Rossi](https://appshunter.io/developer/1803162820)
- Category: Utilities, Productivity
- Price: $2.99
- Age rating: 4+
- Requires: iOS 15.6 · 2 MB
- Languages: American English
- Released: 2026-06-03
- Data updated: 2026-06-22
- User reviews in markdown: https://appshunter.io/ios/app/simple-rpn/id6771959257/reviews.md

## What is Simple RPN?

The RPN calculator for everyday use.
Not just for engineers or scientists — for anyone who wants to calculate efficiently, precisely and without distractions. From the grocery store to the construction site, from the office to the lab.
Built on Reverse Polish Notation — the method used by Hewlett-Packard engineers since the 1970s — it eliminates parentheses and lets the stack manage the order of operations for you. Once you try it, you won't go back.
— 4-LEVEL STACK — T, Z, Y and X registers always visible. ENTER, DROP, SWAP and R↓ to navigate the stack with precision. Full history with unlimited Undo and Redo.
— SCIENTIFIC FUNCTIONS — Full trigonometry (sin, cos, tan and inverses) in degrees or radians. Natural and base-10 logarithms, exponentials, powers, roots, π. Factorial, MOD, configurable rounding in steps of 1, ½ or ¼.
— PERCENTAGES AND STATISTICS — Percentage of total (%T), percentage change (Δ%), TAX calculation with three customisable tax rates and instant reverse. Configurable tip calculator. Statistics accumulator with mean, selective add and remove.
— MEMORY — Ten persistent registers (M1–M10) saved between sessions. Perfect for exchange rates, project constants or any reference value.
— INTERFACE — Four-row display always easy to read. Sans or Mono font. Thousands separator, 0 to 10 decimal places, DEG/RAD mode with visual indicator. History browsing with a swipe on the display.
— AD-FREE — No banners, no notifications, no subscriptions. One complete app, forever.
Full user manual with examples: https://stileottica.ch/app


## Version history (last 5 releases)

### 1.3.24 — 2026-06-16

Minor improvements

### 1.3.21 — 2026-06-15

Minor improvements

### 1.3.20 — 2026-06-13

Minor improvements

### 1.3.19 — 2026-06-04

Minor improvements

### 1.3.17 — 2026-06-03

Tax buttons now display the stored percentage value directly on the label (e.g. + Tax 8.1%, − Tax 2.6%).

## More apps by Nicolas Augsburger Rossi

- [ARN-Music 3-4](https://appshunter.io/ios/app/arn-music-3-4/id6743497768)
- [ARN G6 3-4](https://appshunter.io/ios/app/arn-g6-3-4/id6743498770)
- [ARN-Music 3](https://appshunter.io/ios/app/arn-music-3/id6743633914)
- [ARN B5 3-4](https://appshunter.io/ios/app/arn-b5-3-4/id6744575536)
- [ARN B4 3-4](https://appshunter.io/ios/app/arn-b4-3-4/id6744577173)
- [CL-1](https://appshunter.io/ios/app/cl-1/id6767980060)

All apps by Nicolas Augsburger Rossi: https://appshunter.io/developer/1803162820

## Related topics

[simple rpn](https://appshunter.io/ios/topics/simple-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 2026-06-22.*