# Halcyon Calc vs RPN

The clearest difference is iOS requirement: RPN at 12.0 against Halcyon Calc's 16.6. On price, rating, review sentiment and ratings volume there is nothing between them.

Halcyon Calc costs $4.99 and RPN $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.9 for Halcyon Calc against 4.9 for RPN. Both are backed by a comparable volume of ratings — 18 and 11 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Halcyon Calc ships an update every 4 months, RPN every 3 months. The most recent releases landed on October 31, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | Halcyon Calc | RPN |
| --- | --- | --- |
| Price | $4.99 | $4.99 |
| Rating | [4.9 (18 ratings)](https://appshunter.io/ios/app/halcyon-calc/id327064659/reviews) | **[4.9 (11 ratings)](https://appshunter.io/ios/app/rpn-97-pro/id816249055/reviews)** |
| Number of ratings | **18** | 11 |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 3 months** |
| Monetization | Paid | Paid |
| Size | 10 MB | 75 MB |
| Requires iOS | 16.6 | **12.0** |
| Devices | **iPhone, iPad** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Halcyon Touch Software](https://appshunter.io/developer/327064662) | [CuVee Software](https://appshunter.io/developer/424873503) |

## 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


### RPN

[App page](https://appshunter.io/ios/app/rpn-97-pro/id816249055)

This app simulates a legendary 1970s programmable calculator, offering advanced features for scientists and engineers. It allows users to run programs, manage virtual cards, and access hundreds of free program cards from its website.

**Highlights:** Virtual program and data cards, Virtual paper tape printer, Database-driven card manager, Create, label, and organize unlimited cards, Effortless saving of card collections, Formatted program listings, Live display of stack and registers

**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 RPN free?

RPN costs $4.99, with no in-app purchases.

### Which has better reviews, Halcyon Calc or RPN?

RPN is rated higher. Halcyon Calc averages 4.9 out of 5 from 18 ratings, while RPN averages 4.9 from 11 ratings.

### Do Halcyon Calc or RPN have ads?

Neither Halcyon Calc nor RPN shows ads.

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

Halcyon Calc ships an update every 4 months, and RPN every 3 months. Most recently, Halcyon Calc was updated on October 31, 2026 and RPN on October 20, 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.*