---
title: "Janus Calculator - Reviews, Revenue and Downloads in United Kingdom | Apple App Store"
description: "Two-sided calculator.  Side A uses Standard Notation, Side B uses Reverse Polish Notation.  Both calculators are programmable, include various finance and scientific functions, and the values of 45 ph"
---

# Janus Calculator — United Kingdom

![Janus Calculator App Icon](https://is1-ssl.mzstatic.com/image/thumb/Purple211/v4/89/ad/29/89ad290c-3abd-3b93-50d8-a55507d14a16/AppIcon-0-0-1x_U007emarketing-0-8-0-85-220.png/434x0w.png)

**Developer:** [Geoffrey Domm](https://apptail.io/developer/geoffrey-domm-JWW)
**Category:** Productivity
**Rating:** 4.0/5 (1 ratings)
**Price:** Free
**Bundle ID:** com.gsdomm.hsilopcalculator
**Store:** Apple App Store
**Country:** United Kingdom
**Version:** 2.3 (released 2026-04-29)
**Original Release:** 2010-05-26
**Languages:** English

**App Store Link:** [Download on Apple App Store](https://apps.apple.com/gb/app/app/id373378721)
**AppTail Page:** [https://apptail.io/app/janus-calculator-QtDe/united-kingdom](https://apptail.io/app/janus-calculator-QtDe/united-kingdom)

## Janus Calculator Description
Two-sided calculator.  Side A uses Standard Notation, Side B uses Reverse Polish Notation.  Both calculators are programmable, include various finance and scientific functions, and the values of 45 physical constants.  Also includes a Black-Scholes option calculator, including calculation of implied values for each of the inputs.

## Janus Calculator Screenshots
- [Screenshot 1](https://is1-ssl.mzstatic.com/image/thumb/Purple116/v4/54/d6/52/54d65261-8f7d-db69-8d3e-dbd662e3d145/mzl.gwqhuroc.png/320x480.png)
- [Screenshot 2](https://is1-ssl.mzstatic.com/image/thumb/Purple116/v4/4e/b5/94/4eb5943e-d0f2-3929-84c4-72b9953839b4/mzl.ylnwuclb.png/320x480.png)

## Janus Calculator Rating Breakdown in United Kingdom
- 5 stars: 0 (0%)
- 4 stars: 1 (100%)
- 3 stars: 0 (0%)
- 2 stars: 0 (0%)
- 1 stars: 0 (0%)

## Janus Calculator Reviews in United Kingdom

### ****- "A neat LITTLE thing"
Took me a while to discover the RPN calculator because as usual, I open my iPad in Landscape orientation - which does not provide any information or flip button until you go into portrait view. In portrait, one can access the info button and choose the RPN calculator; and one's preferences are retained when reverting to landscape.

It functions well but is very small on my screen regardless of orientation. The useful key click is selectable as ON or OFF but when ON, is very load, requiring volume adjustment of the of the device.

But the bottom line is that it functions properly; it's free; and it has no distractive advertising or pop-up prompts for reviews or upgrading.
So, thankyou, Geoffrey: I'm keeping it. [Just wish it were bigger…] ;-)
-- Whapper Stan, 2020-04-25

[View all Janus Calculator reviews and detailed analytics on AppTail](https://app.apptail.io/signup?utm_campaign=ai-crawl&utm_content=reviews)




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

---

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