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Best Hp 15C Calculator Apps

247+ iOS apps curated and reviewed

4.4 avg rating
16 free apps
Updated September 2026

Out of 247+ hp 15c calculator apps on iOS, 16 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.

Compare top Hp 15C Calculator Apps (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Retro 15CRetro 15CFree4.3★ (212)NoNoSep 2026
2HP 15c CalculatorHP 15c Calculator$14.994.8★ (207)NoNoSep 2026
315C Pro Scientific Calculator15C Pro Scientific Calculator$5.993.8★ (281)NoNoAug 2026
4RLM-15CXRLM-15CXFree4.1★ (17)NoYesSep 2026
5HP15C: Scientific CalculatorHP15C: Scientific Calculator$4.992.7★ (3)NoNoAug 2026
6HP-35HP-35Free5.0★ (5)NoNoSep 2026
7Electrical Engineering - liteElectrical Engineering - liteFree4.7★ (252)YesYesSep 2026
8Calculator²Calculator²Free—NoYesMay 2026

Top Picks for Hp 15C Calculator

Retro 15C#1

Retro 15C by Greg Hewgill

Editor's Choice
🔧 Utilities
4.3😊(212 ratings)
Free
Retro 15C screenshot 1
Retro 15C screenshot 2

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.

What We Love

  • 🚀 Lightning-fast calculator
  • 👍 Authentic look and feel of HP 15C
  • 🚀 Faster than real HP 15C
  • 👍 Excellent RPN emulation
  • 👍 Familiar interface for HP 15C users
  • 👍 Great representation of original calculator
  • 👍 Obvious labor of love by developer

Room to Improve

  • 🐛 Doesn't save settings, programs, or memory
  • 🐛 No key press feedback or sound
  • 🐛 Blinking display issue with large calculations
  • 🐛 Bugs with HMS conversions
  • 🐛 Can't close app on newer iPhones
HP 15c Calculator#2

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

Official emulator of HP 15c
Strong Contender
🔧 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
15C Pro Scientific Calculator#3

15C Pro Scientific Calculator by Vicinno Soft LLC

HP 15C emulator
Worth Considering
🔧 Utilities
3.8😞(281 ratings)
$5.99
15C Pro Scientific Calculator screenshot 1
15C Pro Scientific Calculator screenshot 2
15C Pro Scientific Calculator screenshot 3
15C Pro Scientific Calculator screenshot 4
15C Pro Scientific Calculator screenshot 5

This app emulates the HP 15C scientific calculator, offering advanced functions like complex numbers, matrix operations, numerical integration, and root finding. It provides the same capabilities as the original hardware with enhanced performance for your mobile device.

What We Love

  • 🚀 Faithful emulation of original HP-15C
  • 👍 Works just like the real calculator
  • 💡 Convenient to have on phone
  • 🚀 Accurate calculations
  • 👍 Familiar RPN interface

Room to Improve

  • 🐛 Crashes on iOS 13 and later
  • 🐛 Orientation issues on some devices
  • 🐛 Occasional locking up
  • 🐛 Display issues in portrait mode
  • ⚠️ No longer maintained or updated

More Hp 15C Calculator apps to explore

FAQ about Hp 15C Calculator

What are the best hp 15c calculator apps for iPhone?
Retro 15C tops our hp 15c calculator apps ranking as of September 2026, with a 4.3-star average from 212 App Store ratings, and it's free to download.
Yes — 16 of the top hp 15c calculator apps we rank are free to download, including Retro 15C and RLM-15CX.
Retro 15C has no ads and has no in-app purchases, according to its App Store listing as of September 2026.
We track 247+ hp 15c calculator apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
The Retro 15C app emulates a classic RPN (Reverse Polish Notation) scientific calculator. It offers a wide range of advanced mathematical functions, including complex number arithmetic, matrix calculations, numerical root finding, and integration.
Key features include complex number arithmetic and trig functions, matrix calculations, a numerical root finder, numerical integration, statistical functions with linear regression, and full programmability. It aims to replicate the functionality of classic 1980s RPN calculators.