RPN vs Calculee
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RPN
This utility app functions as a reverse Polish notation calculator. Users input numbers and operations using a stack-based interface to perform calculations. It's designed for straightforward mathematical tasks.
- Reverse Polish Notation (RPN) input
- Stack-based operation
- Intuitive digit and operation buttons
- Clear result display
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Simple reverse polish notation calculator. To make an operation you tap the number using the digit buttons. When you want to insert the number into the stack you press the orange button "Enter". When you're done inserting the numbers just tap the operation to do it. The result will be displayed but not put again into stack. Example: 6+7 is 6 enter, 7 enter +
Calculee
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The most realistic Calculator! The neumorphic design brings it to the 3D dimension and the haptics makes you feel every gentle press of a key ... The unique and rich color palette will allow you to personalize your iPhone and iPad and make it perfect for your office, home... and even your watch or bag. In addition, you can choose the shape of the buttons: from the classic square to the circle. The calculator is one of the most used tools and it doesn't have to be boring! Depending on your mood, it can be snow-white, red, yellow, black and even... lavender. Download Calculee and make your world look more colorful!
Screenshots
Verdict
The clearest difference is price: RPN at Free against Calculee's $2.99. Calculee's advantage is device support (3 vs 1) and iOS requirement (14.3 vs 16.6). On update cadence, 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
RPN is free to download; Calculee costs $2.99 up front. RPN sells 1 one-off in-app purchase and Calculee sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
RPN ships an update monthly, Calculee every 5 weeks. The most recent releases landed on November 1, 2026 and November 7, 2026 respectively.
| Parameter | RPN | Calculee |
|---|---|---|
| Price | Free — better | $2.99 |
| Positive reviews | 0.0% of reviews | — |
| Update frequency | Monthly — better | Every 5 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 14.3 — better |
| Further details — not scored | ||
| Size | 5 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Tomas Stankiewicz Baldassarri | Mikolaj Adamowicz |
In-app purchases
RPN
- Stack LCD$0.49
Calculee
- Premium Colors$0.99
