Halcyon Calc Lite vs ThetaCalc
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Halcyon Calc Lite
This app is a powerful calculator for students and professionals, offering advanced features like symbolic expression manipulation, graphing, and statistical analysis. It supports real, complex, and integer numbers, matrices, and vectors, making it versatile for various mathematical tasks.
- Symbolic expression manipulation
- Graphing of expressions
- Matrix and vector calculations
- Statistical analysis
- Multiple number formats (decimal, hex, octal, binary)
- Over 225 built-in operations
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For students, engineers, scientists or people who fondly remember classic calculators, Halcyon Calc Lite 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 - 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. - 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.
ThetaCalc
This utility app provides a Reverse Polish Notation (RPN) calculator. Users can extend its functionality by programming custom functions and equations using JavaScript.
- Reverse Polish Notation (RPN) calculator
- User-programmable functions
- JavaScript equation support
- Extensible functionality
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ThetaCalc is a RPN (Reverse Polish Notation) calculator which can be extended by functions and equations programmed by the user in JavaScript.
Screenshots
Verdict
The clearest difference is in-app purchases: ThetaCalc at none against Halcyon Calc Lite's 3. ThetaCalc also leads on ads (none vs shown) and review sentiment (100% vs 67%). Halcyon Calc Lite's advantage is rating (4.6 vs 4.3) and ratings volume (15 vs 4). On price, update cadence, device support and iOS requirement 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
Both are free to download. Halcyon Calc Lite sells 3 one-off in-app purchases. ThetaCalc asks for nothing beyond the download.
Halcyon Calc Lite holds the better App Store score, 4.6 against 4.3. Both are backed by a comparable volume of ratings — 15 and 4 respectively. Written reviews complicate that: 67% of Halcyon Calc Lite's written reviews are positive against 100% of ThetaCalc's, so the app with the better star average is not the one people write more warmly about.
Both ship on a similar rhythm, roughly every 3 months. Both last shipped on October 29, 2026.
| Parameter | Halcyon Calc Lite | ThetaCalc |
|---|---|---|
| Price | Free | Free |
| Rating | 4.6 (15 ratings) — better | 4.3 (4 ratings) |
| Positive reviews | 66.7% of reviews | 100.0% of reviews — better |
| Number of ratings | 15 — better | 4 |
| Update frequency | Every 3 months | Every 3 months |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.6 — better | 17.6 |
| Further details — not scored | ||
| Size | 13 MB | 1 MB |
| Age rating | 4+ | 4+ |
| Developer | Halcyon Touch Software | Felix Stehli |
Customer experience
Halcyon Calc Lite
ThetaCalc
In-app purchases
Halcyon Calc Lite
- Directory And Unit Conversion Support$0.99
- Programming Support$1.99
- Larger Display Upgrade$1.99
ThetaCalc
No in-app purchases
