Comparison

Plottron vs RLM

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

Head to head
About

Plottron

This application offers advanced 2D and 3D graphing capabilities for various function types, alongside a comprehensive scientific calculator. It supports implicit graphing, complex number visualization, and symbolic differentiation. The calculator includes user-defined variables, live evaluation, and probability density functions.

Highlights
  • 2D and 3D graphing
  • Implicit graphing
  • Complex number visualization
  • Symbolic differentiation
  • User-defined variables and functions
  • Live evaluation
  • Calculation history
Features
Read full description

A graphing + scientific calculator. • 2D and 3D graphing Graphs regular functions, parametric relations, and functions in polar/spherical coordinates. • Implicit graphing • Visualization of complex maps w=f(z) featuring domain coloring plots • For 2D functions: Info mode with tangent line and 2nd-order Taylor approximation Scientific calculator features: • User-defined variables and functions • Symbolic derivative (e.g.: D(x, sin(x)) • nCr, nPr, factorial • Complex numbers • Live evaluation (calculate as you type) • Calculation history • Probability density functions: Binomial, Normal (Gaussian), Student’s t • Cumulative probability density functions • Inverse CDF functions: Normal (Gaussian), Student’s t Examples: Implicit graph: cos(X)=sin(Y) Graph a parabola in Regular mode: X^2 Graph a circle in Parametric mode: cos(T);sin(T) Set a variable: X=5 Use a variable: X+4: 9 Define a function: f(X)=X+1 Use a defined function: f(2): 3 Symbolic derivative: D(X,sin(X)): cos(X) Complex magnitude plot in 3D Regular mode: abs(1/cos(X+Yi)) Notes: • Swipe left for settings. • Use semicolon (;) to separate functions in parametric relations. • Swipe down on keypad to show full history. Tap on answer to show keypad again.

About

RLM

This app is a scientific and programmable calculator designed for science and engineering, replicating the functionality of the HP-11C. It offers extensive features for finance, business, statistics, complex numbers, and unit conversions, with a programmable interface for custom calculations.

Highlights
  • Finance calculations (amortization, bond price, Black-Scholes)
  • Business functions (break-even, currency exchange)
  • Statistical analysis (regression, probability distributions)
  • Scientific functions (complex numbers, logarithms, trigonometry)
  • Unit and currency conversions
  • Programmable interface for custom scripts
  • Equation solver
Features
Read full description

The RLM-11C+ application is a general purpose calculator with a special focus science and engineering. It is based in the Hewlett-Packard HP-11C 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

Plottron1 screens
RLM4 screens

Verdict

The call

The clearest difference is review sentiment: Plottron at 100% against RLM's 40%. Plottron also leads on rating (4.8 vs 3.1) and in-app purchases (none vs 4). On price, ratings volume, update cadence and ads 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 4 in-app purchases, starting at $0.49 per month. Plottron asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Plottron holds the better App Store score, 4.8 against 3.1. Both are backed by a comparable volume of ratings — 12 and 7 respectively. Written reviews point the same way: 100% of Plottron's written reviews are positive against 40% of RLM's.

UpkeepUpdate frequency

Plottron ships an update every 2 months, RLM every 5 weeks. The most recent releases landed on November 2, 2026 and November 14, 2026 respectively.

Scorecard4 real differences · 6 level
Plottron versus RLM: the parameters behind the verdict, then further details
ParameterPlottronRLM
PriceFreeFree
Rating4.8 (12 ratings) — better3.1 (7 ratings)
Positive reviews100.0% of reviews — better40.0% of reviews
Number of ratings12 — better7
Update frequencyEvery 2 monthsEvery 5 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size2 MB6 MB
Age rating4+4+
DeveloperBilly LinR.L.M. Software

Customer experience

Plottron

All ratings12 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews7 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

RLM

All ratings7 ratings
Positive42.9%
Neutral14.3%
Negative42.9%
Written reviews5 reviews
Positive40.0%
Neutral0.0%
Negative60.0%

In-app purchases

None

Plottron

No in-app purchases

4 purchases

RLM

Subscriptions3
  • Monthly Subscription$0.491 Month
  • Semi-Annual Subscription$2.996 Months
  • Annual Subscription$5.991 Year
One-time1
  • Lifetime Purchase$9.99

Questions

Is Plottron free?
Plottron is free to download, with no in-app purchases.
Is RLM free?
RLM is free to download, with in-app purchases available.
Which has better reviews, Plottron or RLM?
Plottron is rated higher. Plottron averages 4.8 out of 5 from 12 ratings, while RLM averages 3.1 from 7 ratings.
Do Plottron or RLM have ads?
Neither Plottron nor RLM shows ads.
Which is updated more often, Plottron or RLM?
Plottron ships an update every 2 months, and RLM every 5 weeks. Most recently, Plottron was updated on November 2, 2026 and RLM on November 14, 2026.

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