# |RPN| Scientific Calculator vs Calccis

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.

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.

## The numbers

| Metric | |RPN| Scientific Calculator | Calccis |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/rpn-scientific-calculator/id1069467997/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/calccis/id6446233205/reviews)** |
| Number of ratings | **3** | 1 |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Monetization | Paid | **Free** |
| Size | 2 MB | 1 MB |
| Requires iOS | **16** | 17.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Bradley Smith](https://appshunter.io/developer/1069467996) | [Jukka Aittola](https://appshunter.io/developer/1676073314) |

## What reviewers say

### |RPN| Scientific Calculator

[App page](https://appshunter.io/ios/app/rpn-scientific-calculator/id1069467997)

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.

**Highlights:** Reverse Polish Notation (RPN), Viewable stack, Selectable portrait/landscape layouts, Customizable color schemes, Online visual help, No ads or in-app purchases

**Features:** Vision Pro support

**In-app purchases:** none


### Calccis

[App page](https://appshunter.io/ios/app/calccis/id6446233205)

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.

**Highlights:** 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)

**In-app purchases:** none


## Frequently asked questions

### Is |RPN| Scientific Calculator free?

|RPN| Scientific Calculator costs $0.99, with no in-app purchases.

### Is Calccis free?

Calccis is free to download, with no in-app purchases.

### Which has better reviews, |RPN| Scientific Calculator or Calccis?

Calccis is rated higher. |RPN| Scientific Calculator averages 2.3 out of 5 from 3 ratings, while Calccis averages 5.0 from 1 ratings.

### Do |RPN| Scientific Calculator or Calccis have ads?

Neither |RPN| Scientific Calculator nor Calccis shows ads.

### Which is updated more often, |RPN| Scientific Calculator or Calccis?

|RPN| Scientific Calculator ships an update fortnightly, and Calccis every 3 weeks. Most recently, |RPN| Scientific Calculator was updated on October 24, 2026 and Calccis on October 27, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*