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Best Rpn Apps

201+ iOS apps curated and reviewed

4.4 avg rating
17 free apps
Updated June 2026

From beginner-friendly picks to power-user tools, our rpn list covers 201+ iPhone apps updated through June 2026. Compare ratings, prices, and screenshots in one place.

Top Picks for Rpn

RNP MOVIL#1

RNP MOVIL by Registro Nacional de las Personas Honduras

Editor's Choice
🔧 Utilities
2.2😞(214 ratings)
Free
RNP MOVIL screenshot 1
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RNP MOVIL screenshot 6

This app streamlines birth certificate requests for Honduran citizens using the new DNI. It allows users to check for and correct inconsistencies in the registry database and validate the authenticity of birth and death certificates. Users can also request and store birth certificates directly on their iOS device after scanning their ID.

What We Love

  • ✅ Works on Android devices reliably
  • ⚡ Fast processing when functioning properly
  • 📱 Convenient mobile access to government documents
  • 🎯 Simple interface when operational

Room to Improve

  • 🐛 Frequent crashes and freezing
  • ❌ Non-functional for most users
  • ⏳ Constant 'loading' messages that never complete
RPN#2

RPN by Mediprocesos S.A.

Strong Contender
💪 Health & Fitness
3.8(54 ratings)
Free
RPN screenshot 1
RPN screenshot 2
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RPN screenshot 6

Easily find affiliated healthcare providers by specialty and service type. Access provider phone numbers, authorization details, and download information in PDF format for convenient sharing.

Touch RPN calc#3

Touch RPN calc by Elvis Pfutzenreuter

Financial/Sci RPN calculator
Worth Considering
💰 Finance
3.4😊(207 ratings)
FreeAdsIn-App Purchases
Touch RPN calc screenshot 1
Touch RPN calc screenshot 2
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Touch RPN calc screenshot 6

This app offers a powerful RPN calculator with financial and scientific functions, mimicking popular industry-standard models. It includes programming capabilities and expandable flavors for diverse calculation needs.

What We Love

  • 🚀 Excellent HP calculator emulation
  • 👍 Looks and works like the real thing
  • 👍 Portrait and landscape modes
  • 👍 Paid version is ad-free

Room to Improve

  • 🐛 Ads in free version
  • 🐛 Ads appearing in paid version
  • 🐛 Incorrect calculations

More Rpn apps to explore

4
Free42
Free42
Free42
HP-42S Calculator Simulator
Free

This application is a faithful re-implementation of the HP-42S scientific calculator and its associated printer. It offers full functionality without requiring original HP ROM images and is an open-source project.

HP-42S calculator simulationHP-82240 printer simulationOpen source project
🔧 Utilities
(278)
free
5
iHP48
iHP48
iHP48
The classic HP48 improved
Free

This app brings the powerful HP48 calculator experience to your mobile device. It offers enhanced performance, seamless file management, and a customizable interface with support for various HP calculator models. Enjoy a familiar and convenient calculator solution without needing extra hardware.

Supports HP38, HP39, HP48, HP49, HP50 calculatorsHaptic feedback and customizable zoom optionsSeamless file transfer via iTunes and Files app
📊 Productivity
(270)
free
6
Stack RPN Calculator
Stack RPN Calculator
Stack RPN Calculator
by Dario Bersiga
Free

This scientific calculator displays major functions on screen and utilizes a stack for calculations. It supports a stack of up to 4 values but can store many more numbers depending on device memory.

Visible scientific functionsRPN (Reverse Polish Notation) inputStack display for up to 4 values
📊 Productivity
(2)
free
7
bcRPN
bcRPN
bcRPN
by Paul Wilkins
Free

This utility app functions as a Reverse Polish Notation calculator. It handles complex numbers and utilizes extended precision for all calculations, offering an unlimited stack depth and an undo feature for up to 10 operations.

Reverse Polish Notation (RPN) inputComplex number calculationsExtended precision math
🔧 Utilities
(4)
free
8
Retro 15C
Retro 15C
Retro 15C
by Greg Hewgill
Free

This app emulates a classic RPN scientific calculator, offering advanced features like complex number arithmetic, matrix calculations, and programmability. It provides a functional and complex tool reminiscent of 1980s calculators.

Complex number arithmeticMatrix calculationsNumerical root finder
🔧 Utilities
(212)
free
9
Stackis RPN
Stackis RPN
Stackis RPN
RPN Calculator
Free
$0.99 | 100% OFF

A calculator designed for users who prefer Reverse Polish Notation (RPN). It offers a familiar interface for RPN users and includes support for duodecimal calculations.

RPN calculation styleDuodecimal (dozenal) supportFamiliar interface for RPN users
🔧 Utilities
(2)
free
10
R47 RPN Calculator
R47 RPN Calculator
R47 RPN Calculator
HP Program Editor & Tutorials
Free

This scientific calculator uses Reverse Polish Notation (RPN) to help you break down complex problems. It offers a full 47-series instruction set with advanced functions and a program editor. The free version includes extensive tutorials and documentation.

RPN scientific calculator47-series instruction setProgram editor
📚 Education
(19)
freemium
11
SwiftRPN
SwiftRPN
SwiftRPN
by Patrick Gelvin
Free
🔧 Utilities
(0)
12
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
(216)
paid
13
Calculator - Pad Edition
Calculator - Pad Edition
Calculator - Pad Edition
Fulfill the missing calculator
Free

This app provides a comprehensive calculator experience, filling the gap for a built-in option on iPads. It offers basic, scientific, fraction, programmer, and tip calculations, along with unit and currency conversion. The interface is designed with a modern flat UI, supporting various orientations and multitasking features.

Basic and scientific calculationsFraction and programmer calculatorsUnit and currency converter
🔧 Utilities
(353K)
free with in-app purchases
14
RPN Memory Calculator
RPN Memory Calculator
RPN Memory Calculator
RPN Multi Function Calculator
Free

This application provides a straightforward reverse Polish notation (RPN) calculator with essential functions and memory operations. It also includes integrated unit conversions for various measurements, allowing for quick conversions directly within the app. The calculator remembers your session, preserving all registers and memory values for future use.

Reverse Polish Notation (RPN) inputSeven core calculator functionsMemory operations
📚 Education
(0)
free
15
RPN-70 SD
RPN-70 SD
RPN-70 SD
Very rare vintage calculator
Free

This app is a faithful simulation of a rare 1974 financial calculator, offering all its original functions with enhanced features like more memory registers and a visual stack display. It's designed for users who appreciate vintage technology and need precise financial calculations.

Photo-realistic vintage calculator designFull HP-70 function simulationAnimated keys with sound
📊 Productivity
(11)
free
16
RPN Big Float Calculator
RPN Big Float Calculator
RPN Big Float Calculator
by Stephan Jancar
Free

This advanced calculator offers unparalleled precision for complex mathematical operations, supporting up to 100,000 digits. It features both RPN mode and direct formula input, with a vast array of functions and built-in constants. Explore calculations with complex numbers, quaternions, and p-adic numbers.

High precision up to 100,000 digitsRPN and direct formula input modesComplex number and quaternion calculations
📚 Education
(1)
free
17
Calculator RPN
Calculator RPN
Calculator RPN
RPN everywhere with you.
$4.99
$7.99 | 38% OFF

This scientific calculator offers Reverse Polish Notation (RPN) for faster calculations. It includes 54 mathematical functions, coordinate conversions, and unit conversions, all within a simple interface.

RPN calculation mode54 mathematical functionsTrigonometry (simple and hyperbolic)
🔧 Utilities
(45)
free
18
No Equal RPN Calculator
No Equal RPN Calculator
No Equal RPN Calculator
by Stan Corbin
Free

This scientific calculator utilizes Reverse Polish Notation (RPN) for efficient complex calculations, mirroring the functionality of classic HP calculators. It features a continuously visible stack for better tracking and includes 10 memory registers, plus a dedicated quadratic equation solver.

Reverse Polish Notation (RPN)Always visible stack10 memory registers
🔧 Utilities
(7)
ad-supported
19
RePNCalc - RPN Calculator Pro
RePNCalc - RPN Calculator Pro
RePNCalc - RPN Calculator Pro
Easy Reverse Polish Notation
Free

This utility app offers a Reverse Polish Notation (RPN) calculator experience for iOS devices. It features customizable key layouts via swipe gestures and long-press options for stack items. External keyboard support is also available.

Reverse Polish Notation (RPN) inputSwipe gesture key layout customizationLong-press stack item options
🔧 Utilities
(1)
free with in-app purchases
20
RPN-25 CE
RPN-25 CE
RPN-25 CE
Highly popular 1975 calculator
$2.99

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.

Photo-realistic simulationProgrammable (99/999 steps)15 user-defined function keys
🔧 Utilities
(9)
paid

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