Calx vs |RPN| Scientific Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calx
This calculator app utilizes Reverse Polish Notation (RPN) for efficient calculations by manipulating numbers on a stack. It offers a guided tutorial, gestural interaction, multiple keypads with various functions, and customization options for fonts and colors.
- Reverse Polish Notation (RPN)
- Gestural interaction
- Multiple keypads (basic, scientific, statistical)
- Customizable fonts and colors
- Guided tutorial
Read full descriptionHide full description
CALX is an RPN calculator — a calculator designed to work with a list of numbers. This means that instead of just typing an equation into your calculator, you push numbers onto a stack, and then apply operations to the lowermost numbers in the stack. It's bizarre, but it makes sense once it clicks. If this all sounds confusing, don't worry! CALX comes with a guided tutorial which will get you up to speed in three minutes. Features: • Gestural interaction: Manipulate your data with simple, intuitive gestures. • Multiple keypads: CALX features an array of basic, scientific, and statistical functions. • Customization: Select from different fonts and colours to find a combination that works for you.
|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
Read full descriptionHide full description
|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
Screenshots
Verdict
The clearest difference is rating: Calx at 5.0 against |RPN| Scientific Calculator's 2.3. Calx also leads on review sentiment (100% vs 60%) and iOS requirement (12.0 vs 16). |RPN| Scientific Calculator's advantage is update cadence (fortnightly vs every 24 months) and device support (4 vs 2). On price, ratings volume, ads and in-app purchases 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
Calx costs $0.99 and |RPN| Scientific Calculator $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Calx holds the better App Store score, 5.0 against 2.3. Both are backed by a comparable volume of ratings — 2 and 3 respectively. Written reviews point the same way: 100% of Calx's written reviews are positive against 60% of |RPN| Scientific Calculator's.
Calx ships an update every 24 months, |RPN| Scientific Calculator fortnightly. The most recent releases landed on August 12, 2026 and September 22, 2026 respectively.
| Parameter | Calx | |RPN| Scientific Calculator |
|---|---|---|
| Price | $0.99 | $0.99 |
| Rating | 5.0 (2 ratings) — better | 2.3 (3 ratings) |
| Positive reviews | 100.0% of reviews — better | 60.0% of reviews |
| Number of ratings | 2 | 3 — better |
| Update frequency | Every 24 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Paid | Paid |
| Devices | iPhone, iPod | iPhone, iPad, iPod, Mac — better |
| Requires iOS | 12.0 — better | 16 |
| Further details — not scored | ||
| Size | 4 MB | 2 MB |
| Age rating | 4+ | 4+ |
| Developer | Daniel Clelland | Bradley Smith |
Customer experience
Calx
|RPN| Scientific Calculator
In-app purchases
Calx
No in-app purchases
|RPN| Scientific Calculator
No in-app purchases
Questions
Is Calx free?
Is |RPN| Scientific Calculator free?
Which has better reviews, Calx or |RPN| Scientific Calculator?
Do Calx or |RPN| Scientific Calculator have ads?
Which is updated more often, Calx or |RPN| Scientific Calculator?
Other comparisons
