SEATTLE, Jan. 18, 2013 /PRNewswire/ -- A father and daughter duo from Seattle have worked together to develop a calculator app which has hit the top of the Amazon Kindle Fire charts.

Calculator Plus, invented by Aidan and Isabel Hughes (12), is now the number one calculator app for the Kindle Fire tablet in the US and UK and is the second-highest rated app in all categories out of a total of 66,280 apps on Amazon's Android App Store.

They had a special reason to celebrate the New Year when they reached one million copies downloaded on Dec 29.

USA Today recently named Calculator Plus as one of their 25 essential Kindle Fire apps and Amazon have pre-installed it on their shop demo models across the US.

Their new Windows 8 app, Calculator Free, is already the most downloaded calculator on that platform after just a month.

Calculator Plus is now available for smartphones from the Google Play Store and the Apple App Store by searching under the firm's name, Digitalchemy.

This is a second success for Aidan and his daughter Isabel (12), who have also invented a unique way to work with fractions.

Fraction Calculator was conceived by the duo while Isabel was doing her math homework in Seattle, Washington.

"After a page of checking answers to fraction problems, we were both exhausted!" said Aidan (41) originally from Dublin, Ireland.

"I knew there had to be a better way, and I thought of a fraction calculator with three keypads that would be fast and easy."

The app has two great features not found elsewhere: An innovative three-keypad layout to enter fractions and a large, easy to read, display that shows fractions the way you write them.

Fraction Calculator was recently released on the Amazon Kindle Fire, where it rapidly rose to the number one paid calculator spot.  It's been in the top five ever since.

"The beauty of the new Calculator Plus app is that it remembers everything you calculate, which makes it perfect when you're working on a number of different tasks, or for comparing things while shopping," said Aidan.

"Again it came from Isabel and I bemoaning the fact that you lose everything when you turn a calculator off."

And for iPad, Aidan and Isabel have two apps: Easy Fraction Calculator, with beautiful backgrounds, and Fraction Calculator Plus that includes a handy ruler for woodworkers.

Hughes began his foray into the world of computers at the age of 12 by programming a baking game for his brother Kevin, who suffers from epilepsy.

After leaving school early, he got a job at Dublin computer company, Fred Crowe Limited, where his first task was putting Irish plugs on US computer cords. By the age of 20, he was the senior programmer at the firm.

A year later he started Digital Alchemy Limited and went on to create software for Irish firms, the Irish Government, the United Nations, and various US software companies.

He joined Microsoft in 1999 as a software developer in Seattle and registered more than 20 patents for inventions in computer security.

In his last role at Microsoft, leading the PM team for the Windows 8 Store, he felt the entrepreneurial urge, and left to start app development firm Digitalchemy with friend Micah Koffron.

http://www.amazon.com/Calculator-Plus-Kindle-Tablet-Edition/dp/B007ZGO7EM
http://www.amazon.com/Fraction-Calculator-Kindle-Tablet-Edition/dp/B007TKT2SK
http://apps.microsoft.com/windows/app/calculator-free/07272e57-0f5a-4d6c-9ca5-fe87b8990bad
https://itunes.apple.com/us/app/calculator-plus!-free/id576156235?mt=8
https://itunes.apple.com/us/app/fraction-calculator-free/id580778301?mt=8
https://play.google.com/store/apps/details?id=com.digitalchemy.calculator.freedecimal
https://play.google.com/store/apps/details?id=com.digitalchemy.calculator.fraction

For further information contact Aidan Hughes
+1 (425) 785-9946
aidanh@digitalchemy.us

This press release was issued through eReleases® Press Release Distribution. For more information, visit http://www.ereleases.com.

SOURCE Digitalchemy, LLC