# Halcyon Calc vs Bayes Theorem Calculator

The clearest difference is review sentiment: Halcyon Calc at 100% against Bayes Theorem Calculator's 0%. Halcyon Calc also leads on rating (4.9 vs 1.0) and ratings volume (18 vs 1). Bayes Theorem Calculator's advantage is price (Free vs $4.99) and update cadence (every 5 days vs every 4 months). On ads, in-app purchases and device support there is nothing between them.

Bayes Theorem Calculator 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 holds the better App Store score, 4.9 against 1.0. That said, the two scores are not equally well evidenced: Halcyon Calc has 18 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 100% of Halcyon Calc's written reviews are positive against 0% of Bayes Theorem Calculator's.

Halcyon Calc ships an update every 4 months, Bayes Theorem Calculator every 5 days. The most recent releases landed on October 31, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Halcyon Calc | Bayes Theorem Calculator |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.9 (18 ratings)](https://appshunter.io/ios/app/halcyon-calc/id327064659/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/bayes-theorem-calculator/id1619683902/reviews) |
| Number of ratings | **18** | 1 |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 5 days** |
| Monetization | Paid | **Free** |
| Size | 10 MB | 40 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Halcyon Touch Software](https://appshunter.io/developer/327064662) | [Stage Coding](https://appshunter.io/developer/1637068135) |

## 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


### Bayes Theorem Calculator

[App page](https://appshunter.io/ios/app/bayes-theorem-calculator/id1619683902)

Calculate event probabilities using Bayes' theorem. This utility app provides a straightforward way to apply the theorem for probability calculations.

**Highlights:** Bayes' theorem calculation, Probability of event calculation, Utility tool, Simple interface

**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 Bayes Theorem Calculator free?

Bayes Theorem Calculator is free to download, with no in-app purchases.

### Which has better reviews, Halcyon Calc or Bayes Theorem Calculator?

Halcyon Calc is rated higher. Halcyon Calc averages 4.9 out of 5 from 18 ratings, while Bayes Theorem Calculator averages 1.0 from 1 ratings.

### Do Halcyon Calc or Bayes Theorem Calculator have ads?

Neither Halcyon Calc nor Bayes Theorem Calculator shows ads.

### Which is updated more often, Halcyon Calc or Bayes Theorem Calculator?

Halcyon Calc ships an update every 4 months, and Bayes Theorem Calculator every 5 days. Most recently, Halcyon Calc was updated on October 31, 2026 and Bayes Theorem Calculator on November 3, 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.*