RPN vs Octuple Calc
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 +
Octuple Calc
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Display eight calculators and perform calculations with each one.
Screenshots
Verdict
The clearest difference is in-app purchases: Octuple Calc at none against RPN's 1. Octuple Calc also leads on update cadence (every 2 weeks vs every 6 weeks) and device support (3 vs 1). RPN's advantage is ads (none vs shown). On price 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
Both are free to download. RPN sells 1 one-off in-app purchase. Octuple Calc asks for nothing beyond the download.
RPN ships an update every 6 weeks, Octuple Calc every 2 weeks. The most recent releases landed on October 3, 2026 and September 28, 2026 respectively.
| Parameter | RPN | Octuple Calc |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| Update frequency | Every 6 weeks | Every 2 weeks — better |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Free | — |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 15.8.3 — better |
| Further details — not scored | ||
| Size | 5 MB | 36 MB |
| Age rating | 4+ | 4+ |
| Developer | Tomas Stankiewicz Baldassarri | Hideaki Uchikoshi |
In-app purchases
RPN
- Stack LCD$0.49
Octuple Calc
No in-app purchases
