Comparison

Halcyon Calc vs Bayes Theorem Calculator

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Halcyon Calc

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
Read full description

For students, engineers, scientists or people who fondly remember classic calculators, Halcyon Calc is a great application for manipulating numbers and even symbolic expressions. Features: - Use this calculator on an iPhone, iPod Touch or an iPad - Use your finger to quickly scroll through the stack to review intermediate results - Copy and paste support - Over 225 built-in operations, including trig, logarithms, real functions, complex operations and more - Allows you to work with real, complex and integer numbers. - Real and complex numbers can be displayed in standard, fixed, scientific and engineering format - Use over 120 built-in units to perform unit conversion or create your own units if the one you want is not already there - Integer numbers can be displayed in decimal, hexadecimal, octal and binary bases - Work with real and complex matrices and vectors. - Enter symbolic expressions and solve them for different values. Even better, solve quadratic formulas, collect and expand factors and terms, find minima, maxima and roots of any expression. - Plot symbolic expressions in X/Y coordinates. Pan the coordinate space by dragging the plot in any direction. Zoom in and out using a pinch gesture. - Determine symbolic derivative, taylor series or numeric integral of an expression. - Store numbers, lists, strings and expressions in symbols. Create hierarchies of symbols to allow you to organize your calculations. - Create sequences of calculator commands into programs, creating your own operations which you can then include in expressions. - Store statistical data and calculate totals, averages, standard deviations, linear regressions, etc over that data. - Calculate the probabilities associated with standard distributions like the normal, F and T distributions.

About

Bayes Theorem Calculator

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
Read full description

The Bayes' theorem calculator helps you calculate the probability of an event using Bayes' theorem.

Screenshots

Halcyon Calc4 screens
Bayes Theorem Calculator3 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard7 real differences · 3 level
Halcyon Calc versus Bayes Theorem Calculator: the parameters behind the verdict, then further details
ParameterHalcyon CalcBayes Theorem Calculator
Price$4.99Free — better
Rating4.9 (18 ratings) — better1.0 (1 ratings)
Positive reviews100.0% of reviews — better0.0% of reviews
Number of ratings18 — better1
Update frequencyEvery 4 monthsEvery 5 days — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.613.0 — better
Further details — not scored
Size10 MB40 MB
Age rating4+4+
DeveloperHalcyon Touch SoftwareStage Coding

Customer experience

Halcyon Calc

All ratings18 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews13 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bayes Theorem Calculator

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews1 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

None

Halcyon Calc

No in-app purchases

None

Bayes Theorem Calculator

No in-app purchases

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.

Other comparisons