Best apps like RPN-55 SD

10+ similar apps compared and reviewed

4.2 avg rating
4 free apps
Updated September 2026

RPN is great, but it's not the only option. Explore 10+ similar apps for iPhone and iPad, each reviewed and rated by real users. Find free alternatives, premium upgrades, and hidden gems.

KobCard

KobCard by KOB MARKETING

Gift Card Information Platform
4.0(62 ratings)
Free
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KobCard is a comprehensive gift card information platform that offers real-time exchange rates, price calculations, and the latest news on gift cards. It serves as a one-stop destination for individuals looking to buy, sell, or stay informed about the world of gift cards.

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Top Alternatives to RPN

DB50X#1

DB50X by Christophe de Dinechin

Color version of DB48X
Editor's Choice
📊 Productivity
5.0(8 ratings)
$9.99
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This scientific calculator offers high-precision computations with arbitrary precision for numbers. It supports advanced functions like complex numbers, matrices, symbolic calculations, and graphing, with a user-friendly interface and extensive built-in help.

DB48X#2

DB48X by Christophe de Dinechin

Spirit of the HP48, revived
Strong Contender
📊 Productivity
4.8(4 ratings)
$4.99
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This advanced scientific calculator offers arbitrary precision computations, RPN and algebraic operations, and extensive graphing capabilities. It supports complex numbers, matrices, symbolic calculations, and over 1000 built-in functions, inspired by the HP48 series.

i41CX+#3

i41CX+ by Antonio Lagana

RPN Calc with Printer and CAS
Worth Considering
📊 Productivity
4.8😊(106 ratings)
$24.99
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This advanced RPN scientific calculator offers workstation-class Computer Algebra System (CAS) capabilities, going beyond traditional replicas. It provides access to an extensive library of modules and programs, enhanced with iOS features, customizable skins, and iCloud support for seamless data management.

What We Love

  • 🚀 Fantastic emulation of the original HP41 calculator
  • 🔒 Faithful to the original hardware and functionality
  • 👍 Includes all the expansion modules and accessories
  • 👍 Responsive and never crashes
  • 👍 Excellent implementation of RPN and programmability
  • 👍 Convenient to have a powerful calculator always on hand
  • 👍 Impressive attention to detail, including keyboard clicks

Room to Improve

  • 🔋 Can drain battery when left on
  • 👎 Small button size can lead to mis-taps
  • 👎 Slow startup time in some versions

More apps like RPN

4
DB40X
DB40X
DB40X
High-precision RPL calculator
Free

A high-precision scientific calculator inspired by the HP48 series, offering arbitrary precision computations, complex numbers, vectors, matrices, and graphing. It supports RPN and algebraic operations, with over 1000 built-in functions and a hyperlinked help system.

Arbitrary precision computationsRPN and algebraic operationsComplex numbers, vectors, and matrices
📊 Productivity
(7)
free
5
i41CX
i41CX
i41CX
RPN Calc
$7.99

This app offers a powerful RPN scientific calculator experience, functionally equivalent to a renowned model. It provides extensive memory registers, over 300 built-in functions, and programmability. Advanced features can be unlocked via in-app purchases.

RPN logic with 4-element stack319 main and 124 extended memory registersOver 300 built-in functions
📊 Productivity
(45)
free with in-app purchases
6
WP 34s
WP 34s
WP 34s
by Pascal Meheut
Free

This app is a powerful RPN scientific calculator with extensive functions for mathematics, statistics, programming, and engineering. It includes programmer functions, fraction mode, probability distributions, and a stopwatch, offering a comprehensive tool for complex calculations.

RPN scientific calculator implementationProgrammer functions (binary, octal, hexadecimal)Fraction mode and probability distributions
📊 Productivity
(28)
free
7
WP 31s
WP 31s
WP 31s
by Pascal Meheut
Free

This app emulates a classic RPN scientific calculator, offering a rich function set for daily use with a simplified interface. It's based on the more complex WP 34s but is designed for easier operation.

RPN scientific calculator emulationRich function setSimplified, less cluttered keyboard
📊 Productivity
(15)
free
8
A-Beam+
A-Beam+
A-Beam+
by Jutarus Ratanasethakul
$4.99

This application simplifies the design of RC beams, offering detailed calculation steps for confidence in results. It initially supports ACI 318 building codes in US and Metric units, with plans to add more design codes.

Simplified RC beam designDetailed calculation stepsACI 318 Building Code support
📊 Productivity
(2)
paid
9
RLM-15CX
RLM-15CX
RLM-15CX
Advance Scientific Calculator
Free

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.

Programmable advanced scientific calculatorFinance and business calculation menusStatistics and probability functions
📊 Productivity
(17)
free with in-app purchases
10
iBeams Pro
iBeams Pro
iBeams Pro
by Norm Schuster
$21.99

This app allows engineers to quickly sketch beam designs and instantly view analysis diagrams for shear, moment, and deflection. It offers rapid modification and analysis, streamlining the design process for structural elements. The file format is compatible with its macOS counterpart.

Instant shear, moment, and deflection diagramsSketch beam and loads like on a padRapid modification and analysis
📊 Productivity
(6)
paid