RPN Calculus vs CaIculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RPN Calculus
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.
- 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
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RPN Calculus is a scientific RPN Calculator for the Apple iPad. RPN Calculus provides basic arithmetic operations as well as advanced mathematic operations like trigonometric, hyperbolic or logarithmic functions. The calculator app provides an unlimited, well, limited by system resources, amount of memory space for values. RPN Calculus performs calculations with a precision of up to 15 digits and supports a number range from -1E127 to 1E127. It's smallest presentable number is 1E-128. RPN Calculus offers a clean and simple layout, very common if you have used scientific RPN calculators before. RPN Calculus has a build in constant values database. The database contains over 120 scientific constants of different categories like e.g. Mathematics, Physics or Astronomy. Since the constants database is user extendable, you can add constant values that you are may be missing in the default set of constants. RPN Calculus can print out your values on the stack and the memory.
CaIculator
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.
- 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
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Calculator app. Simple, easy to use, and packed with features to help you get the job done. Our calculator is designed with you in mind, whether you're a student, a professional, or just need to do some quick calculations. Our calculator app features a sleek and intuitive interface, with large buttons and a clear display for easy input and output. Plus, with the backspace key you can correct or change numbers. Other features of our calculator app include support for decimal point or decimal comma, a display log for your calculation, and two themes to choose from!. And with regular updates and new features being added all the time, our calculator app is always improving and getting even better. Download our calculator app today and experience the ultimate in calculation convenience and accuracy!
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | RPN Calculus | CaIculator |
|---|---|---|
| Price | $1.99 | Free — better |
| Rating | 4.0 (1 ratings) | 4.9 (22 ratings) — better |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| Number of ratings | 1 | 22 — better |
| Update frequency | Every 4 months — better | Every 5 months |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPad | iPhone, iPad, iPod — better |
| Requires iOS | 12.0 | 12.0 |
| Further details — not scored | ||
| Size | 11 MB | 61 MB |
| Age rating | 4+ | 4+ |
| Developer | Thomas Braun | Edison Largo |
Customer experience
RPN Calculus
CaIculator
In-app purchases
RPN Calculus
No in-app purchases
CaIculator
- Remove Ads$3.99
Questions
Is RPN Calculus free?
Is CaIculator free?
Which has better reviews, RPN Calculus or CaIculator?
Do RPN Calculus or CaIculator have ads?
Which is updated more often, RPN Calculus or CaIculator?
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