# RPN Calculus vs CaIculator

The clearest difference is price: CaIculator at Free against RPN Calculus's $1.99. CaIculator also leads on rating (4.9 vs 4.0) and ratings volume (22 vs 1). RPN Calculus's advantage is in-app purchases (none vs 1) and ads (none vs shown). On review sentiment, update cadence and iOS requirement there is nothing between them.

CaIculator is free to download; RPN Calculus costs $1.99 up front. CaIculator sells 1 one-off in-app purchase. RPN Calculus asks for nothing beyond the download.

CaIculator holds the better App Store score, 4.9 against 4.0. That said, the two scores are not equally well evidenced: CaIculator has 22 ratings behind it against 1, so its average is the more settled of the two. Written reviews split almost evenly too, at 100% and 100% positive.

RPN Calculus ships an update every 4 months, CaIculator every 5 months. The most recent releases landed on October 14, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | RPN Calculus | CaIculator |
| --- | --- | --- |
| Price | $1.99 | **Free** |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/rpn-calculus/id374359458/reviews) | **[4.9 (22 ratings)](https://appshunter.io/ios/app/caiculator/id6447991457/reviews)** |
| Number of ratings | 1 | **22** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 5 months |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 11 MB | 61 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Thomas Braun](https://appshunter.io/developer/296553965) | [Edison Largo](https://appshunter.io/developer/978541799) |

## What reviewers say

### RPN Calculus

[App page](https://appshunter.io/ios/app/rpn-calculus/id374359458)

This scientific calculator app for iPad offers a clean RPN interface with basic and advanced functions. It supports high precision calculations and provides an extensive, user-extendable database of scientific constants.

**Highlights:** RPN (Reverse Polish Notation) interface, Basic and advanced mathematical functions, High precision calculations (up to 15 digits), Extensive scientific constant database, User-extendable constant database, Memory space for values

**In-app purchases:** none


### CaIculator

[App page](https://appshunter.io/ios/app/caiculator/id6447991457)

A simple and intuitive calculator app designed for ease of use. It offers features like a backspace key, decimal point/comma support, calculation history, and customizable themes. Regular updates ensure continuous improvement.

**Highlights:** Intuitive interface with large buttons, Backspace key for corrections, Decimal point or comma support, Calculation history display, Two customizable themes, Regular updates with new features

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


## Frequently asked questions

### Is RPN Calculus free?

RPN Calculus costs $1.99, with no in-app purchases.

### Is CaIculator free?

CaIculator is free to download, with in-app purchases available.

### Which has better reviews, RPN Calculus or CaIculator?

CaIculator is rated higher. RPN Calculus averages 4.0 out of 5 from 1 ratings, while CaIculator averages 4.9 from 22 ratings.

### Do RPN Calculus or CaIculator have ads?

CaIculator shows ads; RPN Calculus does not.

### Which is updated more often, RPN Calculus or CaIculator?

RPN Calculus ships an update every 4 months, and CaIculator every 5 months. Most recently, RPN Calculus was updated on October 14, 2026 and CaIculator on October 7, 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.*