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Best RPN alternatives: apps like RPN-45 SD

10+ similar apps compared and reviewed

4.3 avg rating
5 free apps
Updated November 2026
RPN-45 SD
RPN-45 SD
CuVee Software
🔧 Utilities
📊 Productivity

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
📊 Productivity
4.1(392 ratings)
Free
KobCard screenshot 1
KobCard screenshot 2
KobCard screenshot 3
KobCard screenshot 4

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.

Get More Info

Top Alternatives to RPN

i41CX+#1

i41CX+ by Antonio Lagana

RPN Calc with Printer and CAS
Editor's Choice
📊 Productivity
4.8😊(108 ratings)
$24.99
i41CX+ screenshot 1
i41CX+ screenshot 2
i41CX+ screenshot 3
i41CX+ screenshot 4
i41CX+ screenshot 5

This advanced RPN calculator offers workstation-class CAS capabilities, emulating the HP-41CX with extensive module support. It features a virtual thermal printer/plotter, full-screen text editor, and integrates with iOS hardware for enhanced functionality.

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
DB50X#2

DB50X by Christophe de Dinechin

Color version of DB48X
Strong Contender
📊 Productivity
5.0(9 ratings)
$9.99
DB50X screenshot 1
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DB50X screenshot 3
DB50X screenshot 4

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#3

DB48X by Christophe de Dinechin

Spirit of the HP48, revived
Worth Considering
📊 Productivity
4.2(6 ratings)
$4.99
DB48X screenshot 1
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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.

More apps like RPN

4
i41CX
i41CX
i41CX
RPN Calc
$7.99

This app offers a powerful RPN scientific calculator experience, functionally equivalent to the HP-41CX. It includes over 300 built-in functions, programmability, and device integrations. Advanced features can be unlocked via in-app purchases.

RPN logic with 4-element stackOver 300 built-in functionsProgrammable up to 2000 lines
📊 Productivity
(47)
free with in-app purchases
Compare with RPN
5
Calc-U-59
Calc-U-59
Calc-U-59
Calc-U-59 Calculator Emulation
Free

This app emulates the classic TI-59, TI-58, and TI-58C calculators with cycle-accurate precision. It includes features like a virtual magnetic card reader, a PC-100C printer, and a CPU-level debugger for in-depth analysis. Explore old programs or learn how these vintage machines operated.

Cycle-accurate TI-59, TI-58, TI-58C emulationVirtual magnetic card readerPC-100C printer emulation
📊 Productivity
(2)
free
Compare with RPN
6
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
Compare with RPN
7
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
(29)
free
Compare with RPN
8
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
Compare with RPN
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
(18)
free with in-app purchases
Compare with RPN
10
Slide Rule
Slide Rule
Slide Rule
by Masayuki Akamatsu
$0.99

Simulates a mechanical analog computer for scientific and engineering calculations. Perform multiplication, division, roots, and trigonometric functions with a digital slide rule.

Multiplication and divisionSquare and cube rootsTrigonometry functions
📊 Productivity
(1)
paid
Compare with RPN
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