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Best apps like Plus42

10+ similar apps compared and reviewed

4.6 avg rating
3 free apps
Updated August 2026
Plus42
Plus42
Thomas Okken
🔧 Utilities

Looking for something like Plus42? We've analyzed 10+ similar apps to help you find the best alternative. Each app is compared by ratings, features, and real user reviews, so you can make the right choice.

Top Alternatives to Plus42

HP 15c Calculator#1

HP 15c Calculator by MORAVIA Consulting, spol. s r.o.

Official emulator of HP 15c
Editor's Choice
🔧 Utilities
4.8😊(204 ratings)
$14.99
HP 15c Calculator screenshot 1
HP 15c Calculator screenshot 2
HP 15c Calculator screenshot 3
HP 15c Calculator screenshot 4

Experience the official emulator of the legendary HP 15c scientific calculator. This app offers a redesigned interface and modern look while preserving the precision and reliability of the original. It features RPN input, matrix calculations, complex functions, and numerical integration for professionals and students.

What We Love

  • 🚀 Excellent emulation of original HP 15C
  • 👍 Faithful reproduction of classic calculator
  • 👍 Includes original manual
  • 👍 Works just like the real thing

Room to Improve

  • 🐛 Display issues in portrait mode
  • 🐛 Bugs with programming and trig functions
  • 🔇 Loud button click sound
RPN-25 CE#2

RPN-25 CE by CuVee Software

Highly popular 1975 calculator
Strong Contender
🔧 Utilities
4.6(9 ratings)
$2.99
RPN-25 CE screenshot 1
RPN-25 CE screenshot 2
RPN-25 CE screenshot 3
RPN-25 CE screenshot 4
RPN-25 CE screenshot 5
RPN-25 CE screenshot 6

This app is a photo-realistic simulation of the classic HP-25 scientific calculator. It offers advanced programming features, a vast function library, and modern enhancements for enhanced usability on iOS devices.

HP-35#3

HP-35 by Enrique Haro

RPN Calculator. HP-35, 45, 21
Worth Considering
🔧 Utilities
5.0(5 ratings)
Free
HP-35 screenshot 1
HP-35 screenshot 2
HP-35 screenshot 3
HP-35 screenshot 4
HP-35 screenshot 5

Emulates classic Hewlett Packard RPN scientific calculators from the 1970s. Experience the original HP-35, HP-45, and HP-21 models on your iPhone.

More apps like Plus42

4
RPN-67 SD
RPN-67 SD
RPN-67 SD
Vintage Programmable Calc
$3.99

This app simulates a vintage programmable calculator from the mid-70s, offering enhanced features beyond the original. It allows users to run existing programs, manage virtual cards, and utilize advanced functions for scientific and engineering tasks.

Virtual program and data cardsVirtual paper tape printerDatabase-driven card manager
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paid
5
TechniCalc Calculator
TechniCalc Calculator
TechniCalc Calculator
Scientific & Engineering
$7.99

This app offers a modern, intuitive interface for complex calculations, supporting scientific, engineering, and advanced mathematical functions. It allows natural equation entry, provides a formula book, and includes unit and currency converters. Available across Apple devices, it caters to students and professionals needing a powerful calculation tool.

Natural equation entryAdvanced math engineFormula book and equations
🔧 Utilities
(75)
free with in-app purchases
6
RLM-11CX
RLM-11CX
RLM-11CX
Scientific & Programable
Free

This app is a scientific and programmable calculator designed for science and engineering, replicating the functionality of the HP-11C. It offers extensive features for finance, business, statistics, complex numbers, and unit conversions, with a programmable interface for custom calculations.

Finance calculations (amortization, bond price, Black-Scholes)Business functions (break-even, currency exchange)Statistical analysis (regression, probability distributions)
🔧 Utilities
(7)
free with in-app purchases
7
RPN-97 Pro
RPN-97 Pro
RPN-97 Pro
Vintage Desktop Calculator
$4.99

This app simulates a legendary 1970s programmable calculator, offering advanced features for scientists and engineers. It allows users to run programs, manage virtual cards, and access hundreds of free program cards from its website.

Virtual program and data cardsVirtual paper tape printerDatabase-driven card manager
🔧 Utilities
(11)
paid
8
RPN Calculator 48
RPN Calculator 48
RPN Calculator 48
RPN Scientific Calculator
$3.99

This app offers a scientific calculator with Reverse Polish Notation (RPN) functionality, providing an alternative to the default calculator. It features a large, easy-to-read display, a 100-entry stack, and extensive undo/redo capabilities. Its design is inspired by classic HP calculators.

Reverse Polish Notation (RPN)Scientific calculator functionsSwipe gestures for undo/redo
🔧 Utilities
(237)
paid
9
Halcyon Calc
Halcyon Calc
Halcyon Calc
by Halcyon Touch Software
$4.99

A powerful calculator app for students, engineers, and scientists. It handles complex numbers, symbolic expressions, unit conversions, and matrix operations, with advanced plotting and programming capabilities.

Complex number calculationsSymbolic expression manipulationUnit conversion with custom units
🔧 Utilities
(17)
paid
10
my41CX
my41CX
my41CX
HP-41 Microcode Emulator
Free

Experience the most accurate HP-41CX calculator emulation. This app provides full microcode-level emulation of the original NUT processor, ensuring 100% hardware-accurate behavior. It features a modern interface, expandable ROM modules, and built-in documentation for a classic yet contemporary user experience.

True microcode emulationModern user interfaceExpandable with ROM modules
🔧 Utilities
(2)
free with in-app purchases
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