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Best Hp Rpn Calculator Apps

249+ iOS apps curated and reviewed

4.3 avg rating
12 free apps
Updated September 2026

The best hp rpn calculator apps on iPhone average 4.3★ across 249+ titles — we've ranked them by what real users actually keep on their phones. Updated September 2026.

Compare top Hp Rpn Calculator Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1iHP48iHP48Free4.7★ (270)NoNoAug 2026
2Free42Free42Free4.8★ (283)NoNoSep 2026
3HP 15c CalculatorHP 15c Calculator$14.994.8★ (207)NoNoSep 2026
4Touch RPN calcTouch RPN calcFree3.4★ (208)YesYesSep 2026
5Retro 15CRetro 15CFree4.3★ (212)NoNoSep 2026
6HP-35HP-35Free5.0★ (5)NoNoSep 2026
7R47 RPN CalculatorR47 RPN CalculatorFree5.0★ (23)NoYesSep 2026
8RPN Calculator 48RPN Calculator 48$3.994.8★ (238)NoNoSep 2026

Top Picks for Hp Rpn Calculator

iHP48#1

iHP48 by Alexis Lorca

The classic HP48 improved
Editor's Choice
📊 Productivity
4.7😊(270 ratings)
Free
iHP48 screenshot 1
iHP48 screenshot 2
iHP48 screenshot 3
iHP48 screenshot 4
iHP48 screenshot 5

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.

What We Love

  • 🚀 Excellent emulation of HP48
  • 👍 Familiar and nostalgic feel
  • 👍 Comprehensive functionality
  • 👍 Customizable skins
  • 👍 Haptic feedback
  • 👍 Stable and reliable

Room to Improve

  • 🐛 Occasional crashes or freezes
  • 🐛 Missed keystrokes when typing quickly
  • 🐛 Blank or flickering display
  • 🐛 Compatibility issues with newer iOS versions
Free42#2

Free42 by Thomas Okken

HP-42S Calculator Simulator
Strong Contender
🔧 Utilities
4.8😊(283 ratings)
Free
Free42 screenshot 1
Free42 screenshot 2
Free42 screenshot 3

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.

What We Love

  • 🚀 Faithful reproduction of HP42S
  • 👍 Identical to physical calculator
  • 👍 Runs all original programs
  • 👍 Convenient to have on phone
  • 👍 Haptic feedback on button presses
  • 👍 Customizable skins
  • 👍 Actively maintained and updated

Room to Improve

  • 🐛 Screen not filling entire display on newer devices
  • 🔇 Configurable key click sound missing
  • 🔇 Lack of loud click sound feedback
HP 15c Calculator#3

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

Official emulator of HP 15c
Worth Considering
🔧 Utilities
4.8😊(207 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
  • 👍 Vertical layout with key features
  • 👍 Great update with new features

Room to Improve

  • 🐛 Display issues in portrait mode
  • 🐛 Bugs with programming and trig functions
  • 🔇 Loud button click sound
  • 💰 Expensive for an app

More Hp Rpn Calculator apps to explore

FAQ about Hp Rpn Calculator

What are the best hp rpn calculator apps for iPhone?
iHP48 tops our hp rpn calculator apps ranking as of September 2026, with a 4.7-star average from 270 App Store ratings, and it's free to download.
Yes — 12 of the top hp rpn calculator apps we rank are free to download, including iHP48 and Free42.
iHP48 has no ads and has no in-app purchases, according to its App Store listing as of September 2026.
We track 249+ hp rpn calculator apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
iHP48 is a mobile application that revives the classic HP48 calculator experience. It provides enhanced performance and convenience, allowing users to access powerful calculator functions directly on their device without needing a physical calculator.
Key features include support for multiple HP calculator models (HP38, HP39, HP48, HP49, HP50), enhanced user experience with haptic feedback and zoom options, seamless file management for transferring and accessing calculator objects, and access to a comprehensive library of calculator packages and ROMs.