---
title: "Plus42 - Reviews, Revenue and Downloads in Hong Kong SAR China | Apple App Store"
description: "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 19"
---

# Plus42 — Hong Kong SAR China
> Enhanced HP-42S Calc Simulator

![Plus42 App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/77/31/48/7731488a-8cba-04f1-5520-a1896a6b8412/AppIcon-0-0-1x_U007epad-0-1-85-220.png/434x0w.png)

**Developer:** [Thomas Okken](https://apptail.io/developer/thomas-okken-jlm)
**Category:** Utilities
**Rating:** 4.0/5 (1 ratings)
**Price:** Free
**Bundle ID:** com.thomasokken.Plus42
**Store:** Apple App Store
**Country:** Hong Kong SAR China
**Version:** 1.3.13 (released 2026-01-14)
**Original Release:** 2022-04-28
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/hk/app/app/id1597963622)
**AppTail Page:** [https://apptail.io/app/plus42-kCUd/hong-kong](https://apptail.io/app/plus42-kCUd/hong-kong)

## Plus42 Description
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 HP-48/49/50 series; directories for more organized storage of programs and variables; a larger display, with 8 rows and 22 columns (131x64 pixels) by default, which the user may resize at will; time value of money and amortization schedules; and two-dimensional plotting of functions, with ability to zoom and pan, and find integrals and roots from points in the plot.

## Plus42 Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/9a/f9/cc/9af9ccc0-eda7-59ae-ec74-53914d3d7ec0/a55976d7-1623-47fa-b4e2-ae87fc52180a_iPhone11ProMax-Stack.png/1242x2688.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/cb/e6/c5/cbe6c5dc-9d04-8c3d-4662-c5e5ae34b203/ffc0acdb-0e3c-44a3-9c14-2825ee5c6a4b_iPhone11ProMax-Landscape.png/2688x1242.png)
- [Screenshot 3](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/a0/ce/7d/a0ce7df1-fff7-6b27-1c4b-f7342cb503c1/a318fa65-5d8a-468e-9115-c54a84ae0871_iPhone11ProMax-PrintOut.png/1242x2688.png)
- [Screenshot 4](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/ac/22/5b/ac225b41-ac36-de6f-9a53-d605e1fcbf82/7bef187b-205c-42b6-93b3-f0e35134980e_iPhone11ProMax-Equations.png/1242x2688.png)
- [Screenshot 5](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/59/52/fc/5952fc94-61d0-13b3-f2c7-a6320ed3f568/7c92cb17-fc8c-48b5-a9bf-03870ad8110f_iPhone11ProMax-Matrix.png/1242x2688.png)
- [Screenshot 6](https://is1-ssl.mzstatic.com/image/thumb/PurpleSource126/v4/d5/9d/97/d59d973d-6e30-a8a9-ccd3-fabaf4af6901/d6f6158d-e903-41d5-8791-85e475c87357_iPhone11ProMax-Program.png/1242x2688.png)

## Plus42 Rating Breakdown in Hong Kong SAR China
- 5 stars: 0 (0%)
- 4 stars: 1 (100%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)



## Plus42 Store Rankings
| Chart | Country | Category | Rank |
|-------|---------|----------|------|
| Top Paid | Germany | Utilities | #130 |
| Top Paid | Austria | Utilities | #375 |
| Top Paid | Switzerland | Utilities | #403 |
| Top Paid | Finland | Utilities | #413 |
| Top Paid | Belgium | Utilities | #465 |
| Top Paid | Spain | Utilities | #476 |
| Top Paid | Sweden | Utilities | #479 |

## Plus42 Discovered Keywords
- plus42


## Plus42 Available In
- [United States](https://apptail.io/app/plus42-kCUd/united-states)
- [Germany](https://apptail.io/app/plus42-kCUd/germany)
- [United Kingdom](https://apptail.io/app/plus42-kCUd/united-kingdom)
- [France](https://apptail.io/app/plus42-kCUd/france)
- [Japan](https://apptail.io/app/plus42-kCUd/japan)
- [Australia](https://apptail.io/app/plus42-kCUd/australia)
- [Sweden](https://apptail.io/app/plus42-kCUd/sweden)
- [Switzerland](https://apptail.io/app/plus42-kCUd/switzerland)
- [Canada](https://apptail.io/app/plus42-kCUd/canada)
- [Denmark](https://apptail.io/app/plus42-kCUd/denmark)
- [China](https://apptail.io/app/plus42-kCUd/china)
- [Austria](https://apptail.io/app/plus42-kCUd/austria)
- [Spain](https://apptail.io/app/plus42-kCUd/spain)
- [Netherlands](https://apptail.io/app/plus42-kCUd/netherlands)
- [Belgium](https://apptail.io/app/plus42-kCUd/belgium)
- [Brazil](https://apptail.io/app/plus42-kCUd/brazil)
- [Norway](https://apptail.io/app/plus42-kCUd/norway)
- [Italy](https://apptail.io/app/plus42-kCUd/italy)
- [Thailand](https://apptail.io/app/plus42-kCUd/thailand)
- [Finland](https://apptail.io/app/plus42-kCUd/finland)
- [South Africa](https://apptail.io/app/plus42-kCUd/south-africa)
- [Argentina](https://apptail.io/app/plus42-kCUd/argentina)
- [Mexico](https://apptail.io/app/plus42-kCUd/mexico)
- [Poland](https://apptail.io/app/plus42-kCUd/poland)
- [Greece](https://apptail.io/app/plus42-kCUd/greece)
- [Hong Kong SAR China](https://apptail.io/app/plus42-kCUd/hong-kong)
- [Chile](https://apptail.io/app/plus42-kCUd/chile)
- [Singapore](https://apptail.io/app/plus42-kCUd/singapore)
- [Ireland](https://apptail.io/app/plus42-kCUd/ireland)
- [Ukraine](https://apptail.io/app/plus42-kCUd/ukraine)
- [Türkiye](https://apptail.io/app/plus42-kCUd/turkey)
- [Taiwan](https://apptail.io/app/plus42-kCUd/taiwan)
- [Vietnam](https://apptail.io/app/plus42-kCUd/vietnam)
- [Sri Lanka](https://apptail.io/app/plus42-kCUd/sri-lanka)
- [Armenia](https://apptail.io/app/plus42-kCUd/armenia)
- [Azerbaijan](https://apptail.io/app/plus42-kCUd/azerbaijan)
- [Belarus](https://apptail.io/app/plus42-kCUd/belarus)
- [Colombia](https://apptail.io/app/plus42-kCUd/colombia)
- [Czechia](https://apptail.io/app/plus42-kCUd/czechia)
- [Dominican Republic](https://apptail.io/app/plus42-kCUd/dominican-republic)
- [Algeria](https://apptail.io/app/plus42-kCUd/algeria)
- [Ecuador](https://apptail.io/app/plus42-kCUd/ecuador)
- [Egypt](https://apptail.io/app/plus42-kCUd/egypt)
- [Hungary](https://apptail.io/app/plus42-kCUd/hungary)
- [Indonesia](https://apptail.io/app/plus42-kCUd/indonesia)
- [Israel](https://apptail.io/app/plus42-kCUd/israel)
- [India](https://apptail.io/app/plus42-kCUd/india)
- [South Korea](https://apptail.io/app/plus42-kCUd/south-korea)
- [Kuwait](https://apptail.io/app/plus42-kCUd/kuwait)
- [Kazakhstan](https://apptail.io/app/plus42-kCUd/kazakhstan)
- [Lebanon](https://apptail.io/app/plus42-kCUd/lebanon)
- [United Arab Emirates](https://apptail.io/app/plus42-kCUd/united-arab-emirates)
- [Malaysia](https://apptail.io/app/plus42-kCUd/malaysia)
- [Nigeria](https://apptail.io/app/plus42-kCUd/nigeria)
- [New Zealand](https://apptail.io/app/plus42-kCUd/new-zealand)
- [Peru](https://apptail.io/app/plus42-kCUd/peru)
- [Philippines](https://apptail.io/app/plus42-kCUd/philippines)
- [Pakistan](https://apptail.io/app/plus42-kCUd/pakistan)
- [Portugal](https://apptail.io/app/plus42-kCUd/portugal)
- [Romania](https://apptail.io/app/plus42-kCUd/romania)
- [Russia](https://apptail.io/app/plus42-kCUd/russia)
- [Saudi Arabia](https://apptail.io/app/plus42-kCUd/saudi-arabia)
- [Slovenia](https://apptail.io/app/plus42-kCUd/slovenia)

---

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