Comparison

RLM vs my15c

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

Head to head
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.

About

my15c

Features
Read full description

my15C is a faithful emulation of the classic 15C — the legendary RPN scientific programmable calculator, running the original Voyager-series microcode ROM, cycle-accurate. Built for engineers, scientists, and RPN enthusiasts who want the real thing in their pocket — not just a look-alike. FEATURES • Authentic 15C ROM emulation — same logic, same quirks as the original 1982 hardware • Full RPN entry with a 4-level stack • Complex number arithmetic • Matrix operations • Numerical integration (∫f(x)) • Root solving (SOLVE) • Full programmability — write, edit, and run your own programs • Continuous memory with iCloud sync across your devices • Authentic 7-segment LCD display and keyboard layout • Landscape-optimized for iPhone, iPad, and Mac

Screenshots

RLM4 screens
my15c4 screens

Verdict

The call

The clearest difference is update cadence: my15c at every 5 days against RLM's every 4 weeks. RLM's advantage is iOS requirement (15.0 vs 26.0). On price, 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

Both are free to download. RLM sells 1 one-off in-app purchase and my15c sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

RLM ships an update every 4 weeks, my15c every 5 days. The most recent releases landed on September 30, 2026 and October 24, 2026 respectively.

Scorecard2 real differences · 7 level
RLM versus my15c: the parameters behind the verdict, then further details
ParameterRLMmy15c
PriceFreeFree
Rating5.0 (1 ratings) — better—
Number of ratings1 — better—
Update frequencyEvery 4 weeksEvery 5 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.0 — better26.0
Further details — not scored
Size6 MB55 MB
Age rating4+4+
DeveloperR.L.M. SoftwareMiroslav Perovic

In-app purchases

1 purchases

RLM

One-time1
  • Lifetime Purchase$9.99
1 purchases

my15c

One-time1
  • Unlock Full App$9.99

Questions

Is RLM free?
RLM is free to download, with in-app purchases available.
Is my15c free?
my15c is free to download, with in-app purchases available.
Do RLM or my15c have ads?
Neither RLM nor my15c shows ads.
Which is updated more often, RLM or my15c?
RLM ships an update every 4 weeks, and my15c every 5 days. Most recently, RLM was updated on September 30, 2026 and my15c on October 24, 2026.

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