Comparison

i48 vs RLM

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

Head to head
About

i48

This application emulates the HP48GX calculator on your iPhone or iPod touch. It allows you to perform complex calculations like matrix operations and function integration on the go.

Highlights
  • HP48GX calculator emulation
  • Matrix calculations
  • Function integration
  • Mobile calculator
  • On-the-go calculations
Features
Read full description

i48 is an emulator for the HP48GX calculator, so the next time you're out and about and need to do some quick matrix calculations or work out the integral of a function, just whip out your iPhone (or iPod touch) and have at it

About

RLM

This advanced scientific calculator emulates the functionality of the HP-15C, offering comprehensive tools for finance, business, statistics, and scientific calculations. It supports programming, equation solving, and unit conversions, optimized for iOS devices.

Highlights
  • Programmable advanced scientific calculator
  • Finance and business calculation menus
  • Statistics and probability functions
  • Complex numbers and matrix operations
  • Unit and currency conversions
  • Equation solver and programming capabilities
Features
Read full description

The RLM-15CX application is a programable advanced scientific calculator. It is based in the Hewlett-Packard HP-15C calculator, but specially designed to bring up the most of your iOS devices and , at the same time, conserving the easy of use and the functionality 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 Cash Flows: Solve problems where different cash flows occur at regular time intervals. •Unequal Periods Cash Flows: Solve problems where different cash flows occur at different dates. •Depreciation: Calculates depreciation with SL, SOYD, DB or MACRS methods and conventions. values at sight. •Interest Rates: 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. •Matrix: view, create or edit matrices with real or complex elements. •Plane Triangle: Solves a two dimensional triangle (ASA,SAS,SSA and SSS). •Spherical Triangle: Solves a triangle in a sphere’s surface (AAA,AAS,ASA,SAS,SSA and SSS). •Universal Constants: All the NIST-CODATA fundamental physical constants. •Vectors 3D: Operations and functions with vectors in Cartesian, Spherical or Cylindrical coordinates. >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. •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

i481 screens
RLM4 screens

Verdict

The call

The clearest difference is rating: RLM at 4.1 against i48's 3.5. RLM also leads on review sentiment (80% vs 54%) and update cadence (monthly vs every 4 months). i48's advantage is in-app purchases (none vs 4) and ratings volume (196 vs 17). On price, ads 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 4 in-app purchases, starting at $0.49 per month. i48 asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

RLM holds the better App Store score, 4.1 against 3.5. That said, the two scores are not equally well evidenced: i48 has 196 ratings behind it against 17, so its average is the more settled of the two. Written reviews point the same way: 54% of i48's written reviews are positive against 80% of RLM's.

UpkeepUpdate frequency

i48 ships an update every 4 months, RLM monthly. The most recent releases landed on October 8, 2026 and September 30, 2026 respectively.

Scorecard7 real differences · 3 level
i48 versus RLM: the parameters behind the verdict, then further details
Parameteri48RLM
PriceFreeFree
Rating3.5 (196 ratings)4.1 (17 ratings) — better
Positive reviews54.2% of reviews80.0% of reviews — better
Number of ratings196 — better17
Update frequencyEvery 4 monthsMonthly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS12.0 — better15.0
Further details — not scored
Size4 MB6 MB
Age rating4+4+
DeveloperAutomagic Software Pty LtdR.L.M. Software

Customer experience

i48

All ratings196 ratings
Positive57.7%
Neutral8.2%
Negative34.2%
Written reviews142 reviews
Positive54.2%
Neutral9.2%
Negative36.6%

RLM

All ratings17 ratings
Positive70.6%
Neutral11.8%
Negative17.6%
Written reviews15 reviews
Positive80.0%
Neutral13.3%
Negative6.7%

Bugs and requests

i48

Reported bugs

4 issues
  • Memory recovery prompt not working
  • Cursor keys behaving erratically
  • Equation solver locking up the app
  • Keyboard issues on certain devices

Requested features

4 requests
  • Landscape mode support
  • Improved display resolution and graphics
  • Haptic feedback for button presses
  • Ability to assign units to numbers

RLM

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

i48

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
  • One-Time Purchase$9.99

Questions

Is i48 free?
i48 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, i48 or RLM?
RLM is rated higher. i48 averages 3.5 out of 5 from 196 ratings, while RLM averages 4.1 from 17 ratings.
Do i48 or RLM have ads?
Neither i48 nor RLM shows ads.
Which is updated more often, i48 or RLM?
i48 ships an update every 4 months, and RLM monthly. Most recently, i48 was updated on October 8, 2026 and RLM on September 30, 2026.

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