Comparison

HP41CV vs RLM

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

Head to head
About

HP41CV

Experience the functionality of a classic 90s pocket calculator on your iPhone. This app offers UPN calculation with a basic course for new users. Many core functions are available for free, with advanced features offered as optional upgrades.

Highlights
  • HP-41 CV calculator emulation
  • UPN (Reverse Polish Notation) calculation
  • Basic UPN course with examples
  • Core functions available for free
  • Optional advanced features
Features
Read full description

The HP-41 CV for your iPhone! The HP-41 CV was the best and handiest Pocket Calculator in the 90íst. (Part of the Apollo missions!) A UPN calculation with the same genial handling is now available for your iPhone. For all users, not familiar with the UPN Concept, a Basic course with examples is included. The most functions of the HP 41 CV are available free. In addition statistic functions, programmability, persistent Key assignment and new functions like printing will be available as option.

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

HP41CV4 screens
RLM4 screens

Verdict

The call

The clearest difference is rating: RLM at 5.0 against HP41CV's 2.8. RLM also leads on update cadence (every 4 weeks vs every 73 months). HP41CV's advantage is in-app purchases (none vs 1) and ratings volume (22 vs 1). On price, ads, monetization model 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. HP41CV asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

RLM holds the better App Store score, 5.0 against 2.8. That said, the two scores are not equally well evidenced: HP41CV has 22 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

HP41CV ships an update every 73 months, RLM every 4 weeks. The most recent releases landed on October 24, 2026 and September 30, 2026 respectively.

Scorecard4 real differences · 6 level
HP41CV versus RLM: the parameters behind the verdict, then further details
ParameterHP41CVRLM
PriceFreeFree
Rating2.8 (22 ratings)5.0 (1 ratings) — better
Positive reviews11.8% of reviews—
Number of ratings22 — better1
Update frequencyEvery 73 monthsEvery 4 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.015.0
Further details — not scored
Size8 MB6 MB
Age rating4+4+
DeveloperJurgen Anton StrohmerR.L.M. Software

Customer experience

HP41CV

All ratings21 ratings
Positive28.6%
Neutral23.8%
Negative47.6%
Written reviews17 reviews
Positive11.8%
Neutral41.2%
Negative47.1%

RLM

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

In-app purchases

None

HP41CV

No in-app purchases

1 purchases

RLM

One-time1
  • Lifetime Purchase$9.99

Questions

Is HP41CV free?
HP41CV 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, HP41CV or RLM?
RLM is rated higher. HP41CV averages 2.8 out of 5 from 22 ratings, while RLM averages 5.0 from 1 ratings.
Do HP41CV or RLM have ads?
Neither HP41CV nor RLM shows ads.
Which is updated more often, HP41CV or RLM?
HP41CV ships an update every 73 months, and RLM every 4 weeks. Most recently, HP41CV was updated on October 24, 2026 and RLM on September 30, 2026.

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