Best RPN alternatives: apps like RPN-67 SD

10+ similar apps compared and reviewed

4.3 avg rating
7 free apps
Updated October 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.

Top Alternatives to RPN

5.0(5 ratings)
$6.99
GO-29 SciRPN screenshot 1
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GO-29 SciRPN screenshot 3
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GO-29 SciRPN screenshot 6

This app offers a highly accurate simulation of the classic HP-29C programmable scientific calculator. It features RPN input, extensive storage registers, and a wide range of mathematical and statistical functions. Users can program complex calculations, import/export programs, and view detailed program information.

Plus42#2

Plus42 by Thomas Okken

Enhanced HP-42S Calc Simulator
Strong Contender
🔧 Utilities
4.9(79 ratings)
$9.99
Plus42 screenshot 1
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This advanced scientific calculator simulates the classic HP-42S RPN calculator with enhanced features. It offers algebraic expressions, unit conversions, directories for storage, a larger resizable display, financial functions, and 2D plotting with integral and root finding.

RCL-57#3

RCL-57 by Paul Novaes

Worth Considering
🔧 Utilities
0.0(0 ratings)
Free
RCL-57 screenshot 1
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This app faithfully recreates the TI-57 programmable calculator, offering its full scientific functions and programming capabilities. It includes a user manual, sample programs, and features like turbo speed and alphanumeric display.

More apps like RPN

4
HP-35
HP-35
HP-35
RPN Calculator. HP-35, 45, 21
Free

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

RPN calculator emulationHP-35 modelHP-45 model
🔧 Utilities
(59)
free
5
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
6
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
(1)
free with in-app purchases
7
HP15C: Scientific Calculator
HP15C: Scientific Calculator
HP15C: Scientific Calculator
Classic Science Calc for you
$4.99

Relive the classic computing experience with a vintage scientific calculator. This app emulates a beloved 90s model, offering a nostalgic and functional tool for calculations.

Vintage scientific calculator emulationClassic 90s designFunctional for scientific calculations
🔧 Utilities
(3)
paid
8
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
(287)
free
9
Flipper Mobile App
Flipper Mobile App
Flipper Mobile App
For Flipper Zero
Free

Manage your portable multi-tool device data, organize digital keys, and share them with a community of users. This application enhances the functionality of your device for various geeky projects.

Manage device dataOrganize digital keysShare keys with users
🔧 Utilities
(313)
free
10
Meshtastic
Meshtastic
Meshtastic
by Meshtastic LLC
Free

This app enables off-grid, decentralized communication via a low-power mesh network. Send text messages in areas lacking cellular or WiFi service.

Off-grid communicationDecentralized mesh networkLow-power LoRa radio support
🔧 Utilities
(837)
free