RPN Calc vs Complex Conjugate Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
RPN Calc
This app provides a straightforward reverse Polish notation (RPN) calculator experience, inspired by classic HP models. It offers a clean interface with large buttons for quick calculations on iPhone, iPad, and Apple Watch, along with a convenient Today Extension for immediate access.
- Reverse Polish Notation (RPN) input
- Clean, simple interface
- Large, easy-to-press buttons
- iPhone, iPad, and Apple Watch support
- Today Extension for quick access
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A simple reverse polish notation calculator loosely based on my trusty HP-32SII that runs on iPhone, iPad, and Apple Watch! If you are familiar with HP RPN calculators, the operation of this calculator should seem very straightforward - albeit simplified. It can't be programmed, and it doesn't handle binary, or hexadecimal numbers. But, it has a clean, simple interface with large, easy to press buttons. It has all of the functions required for quick calculations when your iPhone is handier than your computer or calculator. And, remember those cool calculator watches from the 1980s? Unfortunately, none of them were RPN. RPN Calc brings a reverse polish notation watch calculator to the Apple Watch! In addition to the standard RPN Calculator app that runs on iPhone, iPad, and Apple Watch, RPN Calc includes a handy micro RPN Calc Today Extension available for convenient access to quick calculations from the pull down Today screen.
Complex Conjugate Calculator
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The conjugate of a complex number z=a+bi is the number a-bi
Screenshots
Verdict
The clearest difference is price: Complex Conjugate Calculator at Free against RPN Calc's $0.99. Complex Conjugate Calculator also leads on update cadence (every 6 days vs every 3 months) and iOS requirement (13.0 vs 16.0). On ads, in-app purchases and device support 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
Complex Conjugate Calculator is free to download; RPN Calc costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
RPN Calc ships an update every 3 months, Complex Conjugate Calculator every 6 days. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.
| Parameter | RPN Calc | Complex Conjugate Calculator |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 4.0 (6 ratings) — better | — |
| Positive reviews | 37.9% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 3 months | Every 6 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Requires iOS | 16.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 3 MB | 40 MB |
| Age rating | +4 | 4+ |
| Developer | James Mattis | Stage Coding |
In-app purchases
RPN Calc
No in-app purchases
Complex Conjugate Calculator
No in-app purchases
Questions
Is RPN Calc free?
Is Complex Conjugate Calculator free?
Do RPN Calc or Complex Conjugate Calculator have ads?
Which is updated more often, RPN Calc or Complex Conjugate Calculator?
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