apps / 1597963622
Plus42
Enhanced HP-42S Calc Simulator
Thomas Okken · Utilities · $9.99 · US storefront
- rating
- 4.9 ★
- ratings
- 79
- updated
- Oct 22, 2026
- released
- Apr 28, 2022
v1.4.1
visible word pool · 6 words
title 6/30 chars · subtitle 30/30 chars
App Store search indexes the title and subtitle together with the hidden 100-character keyword field as one combined pool: any phrase assembled from those words can rank. These are the words of Plus42's pool that are public — the keyword field is not exposed by any API.
from the listing
Plus42 is an advanced scientific programmable calculator, based on Free42. Free42, in turn, is a complete re-implementation of the HP-42S scientific programmable RPN calculator, which was made from 1988 until 1995 by Hewlett-Packard. Free42 is a complete rewrite and contains no HP code whatsoever. Plus42 builds on Free42 and adds: Algebraic expressions modeled after those used on the HP-27S and HP-17B/19B; attached units and unit conversions modeled after those used on the…
latest US reviews
★★★★★
Plus42 fanatic simulator
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.
— KAPuser
★★★★★
Not worth of it
Don’t waste your money!
— Abe Aybar
★★★★★
Perfection
Once you use an RPN calculator, you will never go back. The HP-42S beats the HP Prime in layout and ease of use for most task, and the enhancements in this implementation is great. I love having the (enhanced) HP-42S always with me on my iPhone whenever I need a calculator.
— Casually Serious
Newest first, from Apple's public reviews feed. Agents can pull hundreds per storefront with the reviews tool.
Where does it rank? Chart position is one signal — most installs come from keyword search. Check where Plus42 ranks for any keyword, free, with the rank checker.
this page is one tool call
{ "tool": "app", "arguments": { "appId": 1597963622, "countries": [ "US" ], "subtitle": true } }
The app tool returns this listing as stable JSON for any storefront — one of thirteen ASO tools your agent gets over MCP. Get a free key.