|RPN| Scientific Calculator vs Calccis
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
|RPN| Scientific Calculator
This calculator app uses Reverse Polish Notation for powerful calculations. It offers customizable color schemes, layouts, and online help, designed for flexibility and usability. All features are unlocked with a one-time purchase.
- Reverse Polish Notation (RPN)
- Viewable stack
- Selectable portrait/landscape layouts
- Customizable color schemes
- Online visual help
- No ads or in-app purchases
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|RPN| Scientific Calculator is a calculator which features a variety of color schemes and layouts. It utilizes Reverse Polish Notation, a viewable stack, selectable portrait and landscape layouts, online visual help and many more. The application is meant to be as flexible and powerful as possible, without sacrificing usability. |RPN| does not have ads, and never will, nor does it use in-app purchases. All functionality comes with the purchase. Here is a youtube playlist with some helpful videos: https://www.youtube.com/playlist?list=PLucgGVHO2sKhnnNf1gapHS4Zy7u69VGAs
Calccis
This utility app offers advanced calculations using reverse Polish notation. It supports a wide range of functions including trigonometry, logarithms, and matrix operations for real, fractional, and complex numbers. An undo stack allows for up to 100 operations to be reversed.
- Reverse Polish Notation (RPN)
- Basic arithmetic
- Trigonometrical functions (degrees/radians)
- Logarithm and exponent calculations
- Real, fractional, and complex number support
- Matrix calculations
- Undo/Redo stack (100 operations)
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Calccis is a reverse polish notation (RPN) calculator. It supports basic arithmetic, trigonometrical, logarithm and exponent calculations for real, fractional, and complex numbers. Degrees and radians can be used for trigonometrical functions. You can perform matrix calculations, too. There is an undo stack, which supports undoing and redoing the 100 latest operations. Calccis does not copy or mimic any existing physical calculators. However, the operation of the stack has been influenced by how the stack works in the 1990s Hewlett-Packard HP-48 family of calculators.
Screenshots
Verdict
The clearest difference is price: Calccis at Free against |RPN| Scientific Calculator's $0.99. Calccis also leads on rating (5.0 vs 2.3). |RPN| Scientific Calculator's advantage is device support (4 vs 2) and ratings volume (3 vs 1). On update cadence, ads, in-app purchases and iOS requirement there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Calccis is free to download; |RPN| Scientific Calculator costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Calccis holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 3 and 1 respectively.
|RPN| Scientific Calculator ships an update fortnightly, Calccis every 3 weeks. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.
| Parameter | |RPN| Scientific Calculator | Calccis |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 2.3 (3 ratings) | 5.0 (1 ratings) — better |
| Positive reviews | 60.0% of reviews | — |
| Number of ratings | 3 — better | 1 |
| Update frequency | Fortnightly — better | Every 3 weeks |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Free — better |
| Devices | iPhone, iPad, iPod, Mac — better | iPhone, iPad |
| Requires iOS | 16 — better | 17.6 |
| Further details — not scored | ||
| Size | 2 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Bradley Smith | Jukka Aittola |
In-app purchases
|RPN| Scientific Calculator
No in-app purchases
Calccis
No in-app purchases
Questions
Is |RPN| Scientific Calculator free?
Is Calccis free?
Which has better reviews, |RPN| Scientific Calculator or Calccis?
Do |RPN| Scientific Calculator or Calccis have ads?
Which is updated more often, |RPN| Scientific Calculator or Calccis?
Other comparisons
