---
title: "HP16C - Reviews, Revenue and Downloads in United States | Apple App Store"
description: "A faithful recreation of the legendary HP 16C Computer Scientist calculator for iPhone, with a few modern upgrades.  If you've ever needed to perform hex arithmetic, bit manipulation, or base conversi"
---

# HP16C — United States

![HP16C App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple221/v4/de/fd/b8/defdb8c2-d3ad-5fef-5b24-f73c6cd2c2e8/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png)

**Developer:** [Unknown](https://apptail.io/developer/unknown-ABjxkc)
**Category:** Utilities
**Rating:** 4.3/5 (4 ratings)
**Price:** Free
**Bundle ID:** com.imapenguin.HP16C
**Store:** Apple App Store
**Country:** United States
**Version:** 1.0.7 (released 2026-09-25)
**Original Release:** 2026-04-08
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/us/app/app/id6761774728)
**AppTail Page:** [https://apptail.io/app/hp16c-NlVz/united-states](https://apptail.io/app/hp16c-NlVz/united-states)

## HP16C Description
A faithful recreation of the legendary HP 16C Computer Scientist calculator for iPhone, with a few modern upgrades.

If you've ever needed to perform hex arithmetic, bit manipulation, or base conversion on your phone and been frustrated by the available options, this is for you. RPN-16C gives you the full power of the original HP 16C in your pocket.

WHAT IT DOES

- Full RPN (Reverse Polish Notation) calculator
- Integer arithmetic in HEX, DEC, OCT, and BIN
- Configurable word size from 1 to 64 bits
- Unsigned, one's complement, and two's complement modes
- Complete bit operations: shift, rotate, rotate through carry, AND, OR, XOR, NOT, mask, bit set/clear/test, count bits, left justify
- Float mode with configurable precision (FLOAT 0-9)
- Keystroke programming with labels, subroutines, loops, and conditionals
- Storage registers with direct and indirect addressing
- Programs can be imported from text (long-press the display to paste)

ENHANCEMENTS OVER THE ORIGINAL

- Two-line display: see both X and Y registers at once. No more guessing what's on the stack.
- Wider LCD: displays all 32 bits in binary without scrolling. The original could only show 8 at a time.
- Haptic feedback on every key press
- State persistence: pick up right where you left off
- SHOW function to peek at values in other bases

FAIR WARNING
This is a quirky calculator. It uses Reverse Polish Notation, has no equals key, and expects you to know what two's complement means. If you're looking for a simple calculator, this is not it. If you've ever wished you could do a bitwise rotate through carry on your phone, welcome home.

DESIGNED FOR PROGRAMMERS
The key layout matches the physical HP 16C exactly, including the f (gold) and g (blue) shift labels. If you know the original, you already know this one. The original HP 16C Owner's Handbook is freely available on the Internet Archive: 

## HP16C Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/7d/d3/79/7dd379f7-157f-3259-af25-91a4ca919193/02_binary_mode_6_5.png/2688x1242.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/e8/71/fb/e871fbce-11ad-38e7-982f-15a55a5414e3/03_float_mode_6_5.png/2688x1242.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource221/v4/23/a3/59/23a35914-a7ce-4007-1431-4f07117191d5/04_dec_mode_6_5.png/2688x1242.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource211/v4/e4/d2/ff/e4d2ffbe-2967-73d3-0035-4bfcb194ebe7/01_hex_mode_6_5.png/2688x1242.png)

## HP16C Rating Breakdown in United States
- 5 stars: 2 (50%)
- 4 stars: 1 (25%)
- 3 stars: 1 (25%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)






## HP16C Available In
- [United States](https://apptail.io/app/hp16c-NlVz/united-states)
- [Russia](https://apptail.io/app/hp16c-NlVz/russia)
- [Australia](https://apptail.io/app/hp16c-NlVz/australia)
- [Grenada](https://apptail.io/app/hp16c-NlVz/grenada)
- [Hong Kong SAR China](https://apptail.io/app/hp16c-NlVz/hong-kong)
- [Israel](https://apptail.io/app/hp16c-NlVz/israel)
- [Mexico](https://apptail.io/app/hp16c-NlVz/mexico)
- [Malaysia](https://apptail.io/app/hp16c-NlVz/malaysia)
- [Norway](https://apptail.io/app/hp16c-NlVz/norway)
- [South Africa](https://apptail.io/app/hp16c-NlVz/south-africa)
- [Brunei](https://apptail.io/app/hp16c-NlVz/brunei)
- [Canada](https://apptail.io/app/hp16c-NlVz/canada)

---

## About AppTail

[AppTail](https://apptail.io) is a mobile app intelligence platform providing app analytics, ASO (App Store Optimization) tools, keyword tracking, competitor analysis, revenue estimates, and review monitoring for iOS App Store apps. Track your app's performance, discover ranking keywords, monitor competitors, and analyze market trends.

- [Search Apps](https://apptail.io)
- [Top Charts](https://apptail.io/top-iphone-apps)
- [Sign Up for Full Access](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=footer)

*Data provided by [AppTail](https://apptail.io) - Mobile App Intelligence Platform*