Plus42

Name: Plus42
Price: 9.99 USD
Rating: 4.9 (79 reviews)
Author: Thomas Okken

By: Thomas Okken App

Enhanced HP-42S Calc Simulator

Overview

Version:

1.3.15

Last updated: 2026-05-05

Ranking

#143,901 ▼ 15

Overall

Features & Capabilities

Plus42 is an advanced scientific programmable calculator based on Free42, a complete re-implementation of the HP-42S. It preserves the HP-42S capabilities while extending them with modern features and a Chrome-friendly interface.

Key enhancements include algebraic expressions similar to HP-27S/HP-17B/19B, attached units and conversions, organized program and variable storage, a larger resizable display, money-time value calculations, amortization schedules, and 2D plotting with zoom, pan, and integral/root-from-plot-point support.

User Growth & Download Statistics

App Education Programming Open Source Developer Tools

By:

Thomas Okken

Rating:

4.90

(79)

Version:

1.3.15 Last updated: 2026-05-05

Version code:

885258003

Creation date:

2022-04-28

Compatible devices:

Size:

11.45MB

Price:

9.99

URLs:

Website ,Privacy policy

Full description:

Source:

Apple Apps Store

Data ingested on:

2026-08-14

Compare stats and ranking:

Ranking

# 143,901 ▼ 15

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.

Developed by:

Thomas Okken

Apple Apps Store

https://apps.apple.com/us/app/plus42/id1597963622

Website:

https://thomasokken.com/plus42/

User Reviews

Plus42 is widely praised for faithfully recreating the HP-42S RPN calculator on iPhone and iPad, delivering nostalgic fidelity, portability, and a polished, feature-rich experience that surpasses Free42. Reviewers value its faithful feel, the ability to have a powerful calculator in their pocket, and the strong graphics/UI. Many call it the best HP-inspired calculator app. Some note a programming issue, iPad multitasking limitations, and requests for more programming capabilities (e.g., TVM variables). Overall, user sentiment is highly positive with occasional feature requests.

Pros

Faithful HP-42S recreation with nostalgic fidelity
Portable/mobile access: always with you on iPhone/iPad
Rich feature set and enhancements (e.g., Dir and Eqn)
Beautiful, polished graphics and UI
Intuitive and easy to use for RPN users

Cons

Recent reviews

This is a fantastic HP-42S simulator. Very functional, I use it daily. My HP calculator has long been dead and this allows me to use an RPN scientific calculator in daily engineering tasks. Thank you.