Comparison

Halcyon Calc Lite vs RLM

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

Head to head
About

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.

Highlights
  • Symbolic expression manipulation
  • Graphing of expressions
  • Matrix and vector calculations
  • Statistical analysis
  • Multiple number formats (decimal, hex, octal, binary)
  • Over 225 built-in operations
Features
Read full description

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.

About

RLM

This scientific calculator offers a comprehensive suite of tools for finance, business, statistics, and complex scientific calculations. It emulates a classic calculator while leveraging modern iOS device capabilities for ease of use and advanced functions.

Highlights
  • Finance and Business calculations
  • Date and Time interval calculations
  • Advanced Statistics and Curve Fitting
  • Complex Numbers and 3D Vectors
  • Unit and Currency Conversions
  • Equation Solver
  • Programmable functions
Features
Read full description

The RLM-10CX application is a general purpose calculator with a special focus in science and engineering. It is based in the Hewlett-Packard HP-10C calculator, but specially designed to bring up the most of your iOS devices and , at the same time, conserving the easy of use and all functions originally provided by the real calculator. >Finance Menu: •Account Balance: Credit line type account based on cash transactions and interest rates applied. •Amortization: Loan Amortization Schedule for a single loan payment or from several payments at once. •Bond Price & Yield: Bonds calculations in an easy way with all options and values at sight. •Black-Scholes Options: CALL, PUT and “Greeks” calculations of the Black-Scholes European option valuation model. •Equal Periods: Calculations with Cash Flows occurring at regular time intervals. •Unequal Periods: Calculations with Cash Flows occurring at arbitrary dates. •Depreciation: Calculates depreciation with SL, SOYD, DB or MACRS methods and conventions. values at sight. •Interest Conversion: Nominal and effective interest conversion. •Time Value of Money: Compound Interest problems involving money earning interest over a period of time. >Business Menu: •Bill-Tip-Split: Calculates the sharing of a Bill with Tip. •Break-Even: Analyze the following relation: Profit = (Price - Var.Cost) • Units - Fix.Cost •Currency Exchange with on-line rates. •Percents & Margins: Calculates %Change, %Total and Business margins. Date / Time Menu: Calculates Date and Time intervals with all values at sight. >Statistics Menu: •One-Variable Statistics: Calculations for one variable data samples. •Two-Variable Statistics: Calculations for two variables data samples. •Curve Fitting: 6 Regression models to fit a curve based on two variables data samples. •Probability: Combinations, permutations, Normal, Exponential, t-Student and Weibull probability distributions. >Scientific Menu: •Complex Numbers: Operations and functions with complex numbers. •Logarithms, Trigonometric, Hyperbolic and Number Alteration functions. •Triangle Solution: Solves a Plane & Spherical triangles. •3D Vectors: Operations and functions with vectors in Cartesian, Spherical or Cylindrical coordinates. •Universal Constants: All the NIST-CODATA physical constants values and descriptions. •Units Conversion: Physical units conversion completely customizable. >Convert Menu: •Angles & Polar: Convert angles between DEG,RAD,GRAD,DMS or Slope % & Polar-Rectangular coordinates. •Currencies: world currencies conversions with manual input or on-line current rates. •Interest Rates: Nominal and effective interest conversion. •Units: Physical units conversions. >Program Menu: Create, edit or load previously saved programs. >Solver Menu: Solve arbitrary algebraic equations entered and saved in the equation editor and creates a menu with all the variables to solve any of them. >Utilities Menu: •General Settings: Customize the calculator to your preference. •Storage Registers: Store and perform operations directly over the calculator’s storage registers. •Memory Content: Shows all memory content edit, backup or restore. •Help Documents: learn by example about all menus. >Editors: submenu to select data editors. System requirements: iOS 15.0 or above. 30 days Free-Trial. In-App-Purchase: One-Payment for life. License Agreement: http://www.apple.com/legal/itunes/appstore/dev/stdeula Disclaimer: THIS IS NOT A HEWLETT PACKARD CALCULATOR, AND IS NOT SPONSORED IN ANYWAY BY HEWLETT PACKARD OR ANY OF ITS SUBSIDIARIES.

Screenshots

Halcyon Calc Lite4 screens
RLM4 screens

Verdict

The call

The clearest difference is ads: RLM at none against Halcyon Calc Lite's shown. RLM also leads on monetization model (free vs free with in-app purchases) and rating (5.0 vs 4.7). Halcyon Calc Lite's advantage is ratings volume (15 vs 1). On price, in-app purchases, 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Halcyon Calc Lite sells 3 one-off in-app purchases and RLM sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

RLM holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: Halcyon Calc Lite has 15 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Halcyon Calc Lite ships an update every 3 months, RLM every 4 weeks. The most recent releases landed on August 29, 2026 and September 10, 2026 respectively.

Scorecard5 real differences · 5 level
Halcyon Calc Lite versus RLM: the parameters behind the verdict, then further details
ParameterHalcyon Calc LiteRLM
PriceFreeFree
Rating4.7 (15 ratings)5.0 (1 ratings) — better
Positive reviews42.9% of reviews—
Number of ratings15 — better1
Update frequencyEvery 3 monthsEvery 4 weeks — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.615.0 — better
Further details — not scored
Size13 MB6 MB
Age rating4+4+
DeveloperHalcyon Touch SoftwareR.L.M. Software

Customer experience

Halcyon Calc Lite

All ratings15 ratings
Positive93.3%
Neutral0.0%
Negative6.7%
Written reviews7 reviews
Positive42.9%
Neutral14.3%
Negative42.9%

RLM

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

3 purchases

Halcyon Calc Lite

One-time3
  • Directory And Unit Conversion Support$0.99
  • Programming Support$1.99
  • Larger Display Upgrade$1.99
1 purchases

RLM

One-time1
  • Lifetime Purchase$9.99

Questions

Is Halcyon Calc Lite free?
Halcyon Calc Lite is free to download, with in-app purchases available.
Is RLM free?
RLM is free to download, with in-app purchases available.
Which has better reviews, Halcyon Calc Lite or RLM?
RLM is rated higher. Halcyon Calc Lite averages 4.7 out of 5 from 15 ratings, while RLM averages 5.0 from 1 ratings.
Do Halcyon Calc Lite or RLM have ads?
Halcyon Calc Lite shows ads; RLM does not.
Which is updated more often, Halcyon Calc Lite or RLM?
Halcyon Calc Lite ships an update every 3 months, and RLM every 4 weeks. Most recently, Halcyon Calc Lite was updated on August 29, 2026 and RLM on September 10, 2026.

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