Best RPN alternatives: apps like RPN-55 SD

10+ similar apps compared and reviewed

4.7 avg rating
6 free apps
Updated November 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
4.1(387 ratings)
Free
KobCard screenshot 1
KobCard screenshot 2
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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.

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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(9 ratings)
$9.99
#91in Productivity
DB50X screenshot 1
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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
4.2(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.

DB40X#3

DB40X by Christophe de Dinechin

High-precision RPL calculator
Worth Considering
📊 Productivity
4.7(7 ratings)
Free
DB40X screenshot 1
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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.

More apps like RPN

4
i41CX+
i41CX+
i41CX+
RPN Calc with Printer and CAS
$24.99

This advanced RPN scientific calculator offers workstation-class CAS capabilities and a virtual thermal printer. It emulates the HP-41CX, providing access to its modules and programs, enhanced with modern iOS features and extensive customization options. Perform complex calculations, symbolic algebra, and 2D/3D plotting without an internet connection.

RPN logic with 4-element stackVirtual thermal printer/plotterWorkstation-class Computer Algebra System (CAS)
📊 Productivity
(108)
paid
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 virtual magnetic cards, a printer, software modules, and a CPU-level debugger for in-depth analysis. Bring your old programs back to life or explore the inner workings of these vintage machines.

Cycle-accurate TI-59, TI-58, TI-58C emulationVirtual magnetic card reader/writerPC-100C printer emulation
📊 Productivity
(2)
free
6
i41CX
i41CX
i41CX
RPN Calc
$7.99

This advanced programmable RPN scientific calculator offers a powerful set of functions and a user-friendly interface. It emulates the functionality of the renowned HP-41CX and can be expanded with additional features through in-app purchases.

RPN logic with 4-element stackOver 300 built-in functionsProgrammable up to 2000 lines
📊 Productivity
(47)
free with in-app purchases
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
8
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
9
RLM-19BX
RLM-19BX
RLM-19BX
Finance & Science calculator
Free

This app offers a comprehensive suite of financial, business, scientific, and statistical calculators. It includes specialized worksheets for loan amortization, bond pricing, currency exchange, probability distributions, and complex number operations. Users can also perform date and time calculations, solve arbitrary equations, and convert units.

Finance worksheets (amortization, bonds, options)Business tools (bill split, break-even, currency)Statistical analysis (probability, regressions)
📊 Productivity
(7)
free with in-app purchases
10
RLM-17BX Calculator
RLM-17BX Calculator
RLM-17BX Calculator
Finance Stats & Science Solver
Free

This app offers a comprehensive suite of calculators for finance, business, science, and general use. It includes specialized worksheets for loans, investments, statistics, and complex mathematical functions, designed to leverage iOS device capabilities.

Finance worksheets (amortization, bond pricing, options)Business calculations (bill split, break-even, currency)Statistical analysis (probability, regressions)
📊 Productivity
(1)
free with in-app purchases