Janus Calculator

Name: Janus Calculator
Rating: 2 (1 reviews)
Author: Geoffrey Domm

Productivity

Free · Designed for iPad. Not verified for macOS.

1 Rating
Age Rating

4+
Years
Category

Productivity
Developer

Geoffrey Domm
Language

EN
English
Size

1.4
MB

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.

Ratings & Reviews

2.0

out of 5

1 Ratings

Correction to previous review
12/16/2017

Cheapskate01
The Janus Calculator appears to be a simulation of the HP-12C augmented with some HP-11C and the Black Scholes functions.Apparently, the current edition is best version; the earlier version is not worth downloading. However, the current version only works on iOS 10 or 11. Therefore, this will not work on earlier iOS devices (like iPad 2 or iPhone 4S). That is why I deduct two stars.Landscape mode makes the Janus Calculator resemble the HP-12C. Minor glitch, both iPhone SE and iPad Pro: "Flip" and "i" are not available in landscape mode. ("Flip" is how to switch between RPN and standard mode; "i" is access to help and other features). No stars deducted for this.
Correction to previous review
12/16/2017

Cheapskate01

The Janus Calculator appears to be a simulation of the HP-12C augmented with some HP-11C and the Black Scholes functions.Apparently, the current edition is best version; the earlier version is not worth downloading. However, the current version only works on iOS 10 or 11. Therefore, this will not work on earlier iOS devices (like iPad 2 or iPhone 4S). That is why I deduct two stars.Landscape mode makes the Janus Calculator resemble the HP-12C. Minor glitch, both iPhone SE and iPad Pro: "Flip" and "i" are not available in landscape mode. ("Flip" is how to switch between RPN and standard mode; "i" is access to help and other features). No stars deducted for this.
Easy interfaces
09/04/2010

Charlie-54
I'm old enough to remember the early handheld calculators, and what a difference it made to have a calculator with a full instruction set and a sensible interface. This app does it well, twice, plus offering a few useful constants. Bravo!
Easy interfaces
09/04/2010

Charlie-54

I'm old enough to remember the early handheld calculators, and what a difference it made to have a calculator with a full instruction set and a sensible interface. This app does it well, twice, plus offering a few useful constants. Bravo!
This is great! Just like my old HP.
05/28/2010

Math Geek 2.0
Love this. Works on my ipad. Well done.
This is great! Just like my old HP.
05/28/2010

Math Geek 2.0

Love this. Works on my ipad. Well done.
Non math geek
11/19/2010

julie119
Easy to understand and operate
Non math geek
11/19/2010

julie119

Easy to understand and operate

Update to IOS26

Version 2.3 Apr 29

Data Not Collected

The developer does not collect any data from this app.

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Accessibility

Information

Seller: Geoffrey Domm
Size: 1.4 MB
Category: Productivity
Compatibility: Requires iOS 26.2 or later.

iPhone
Requires iOS 26.2 or later.

iPad
Requires iPadOS 26.2 or later.

Mac
Requires macOS 26.2 or later and a Mac with Apple M1 chip or later.

Apple Vision
Requires visionOS 26.2 or later.
Languages: English
Age Rating: 4+

4+

Learn More