# RPN Calc vs Complex Conjugate Calculator

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.

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.

## The numbers

| Metric | RPN Calc | Complex Conjugate Calculator |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[4.0 (6 ratings)](https://appshunter.io/ios/app/rpn-calc/id285002799/reviews)** | — |
| Number of ratings | **6** | — |
| Positive reviews | 37.9% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 days** |
| Monetization | Free | — |
| Size | 3 MB | 40 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad, Apple Watch | iPhone, iPad, iPod |
| Age rating | +4 | 4+ |
| Developer | [James Mattis](https://appshunter.io/developer/285002802) | [Stage Coding](https://appshunter.io/developer/1637068135) |

## What reviewers say

### RPN Calc

[App page](https://appshunter.io/ios/app/rpn-calc/id285002799)

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.

**Highlights:** Reverse Polish Notation (RPN) input, Clean, simple interface, Large, easy-to-press buttons, iPhone, iPad, and Apple Watch support, Today Extension for quick access

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


### Complex Conjugate Calculator

[App page](https://appshunter.io/ios/app/complex-conjugate-calculator/id1619685165)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is RPN Calc free?

RPN Calc costs $0.99, with no in-app purchases.

### Is Complex Conjugate Calculator free?

Complex Conjugate Calculator is free to download, with no in-app purchases.

### Do RPN Calc or Complex Conjugate Calculator have ads?

Neither RPN Calc nor Complex Conjugate Calculator shows ads.

### Which is updated more often, RPN Calc or Complex Conjugate Calculator?

RPN Calc ships an update every 3 months, and Complex Conjugate Calculator every 6 days. Most recently, RPN Calc was updated on October 24, 2026 and Complex Conjugate Calculator on October 27, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*