# Halcyon Calc vs RPNu

The clearest difference is price: RPNu at Free against Halcyon Calc's $4.99. RPNu also leads on update cadence (every 2 months vs every 4 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

RPNu is free to download; Halcyon Calc costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Halcyon Calc ships an update every 4 months, RPNu every 2 months. The most recent releases landed on October 31, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Halcyon Calc | RPNu |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.9 (18 ratings)](https://appshunter.io/ios/app/halcyon-calc/id327064659/reviews)** | — |
| Number of ratings | **18** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Paid | — |
| Size | 10 MB | 49 MB |
| Requires iOS | 16.6 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Halcyon Touch Software](https://appshunter.io/developer/327064662) | [Scott Johnson](https://appshunter.io/developer/580251998) |

## What reviewers say

### Halcyon Calc

[App page](https://appshunter.io/ios/app/halcyon-calc/id327064659)

A powerful calculator app for students, engineers, and scientists. It handles complex numbers, symbolic expressions, unit conversions, and matrix operations, with advanced plotting and programming capabilities.

**Highlights:** Complex number calculations, Symbolic expression manipulation, Unit conversion with custom units, Matrix and vector operations, Symbolic plotting, Programming of custom operations, Statistical data analysis

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### RPNu

[App page](https://appshunter.io/ios/app/rpnu/id1195709318)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Halcyon Calc free?

Halcyon Calc costs $4.99, with no in-app purchases.

### Is RPNu free?

RPNu is free to download, with no in-app purchases.

### Do Halcyon Calc or RPNu have ads?

Neither Halcyon Calc nor RPNu shows ads.

### Which is updated more often, Halcyon Calc or RPNu?

Halcyon Calc ships an update every 4 months, and RPNu every 2 months. Most recently, Halcyon Calc was updated on October 31, 2026 and RPNu on October 26, 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.*