Elk is described as 'super fast way to convert currencies, interacting with set values across increments accessed using simple swipes. No need to enter values with a keypad, it lets you just swipe your way to the value you need'. There are more than 25 alternatives to Elk for a variety of platforms, including Android, iPhone, Online / Web-based, iPad and Mac. The best alternative is Numi, which is free. Other great apps like Elk are ConvertAll (Free, Open Source), XE.com (Free), Caligator (Free, Open Source) and Yahoo! Finance - Currencies Center (Free).
A kickass, open-source calculator that lets you do calculations and unit conversions naturally, with features like: - weight conversion - length conversion - temperature conversion - currency conversion Super simple to use. Caligator works the way you think.
Convertbot is a unit conversion robot. Convert currency, length, mass, time and much more in an exciting new way! Converting numbers will never again be a mundane task. In addition to its innovative interface, our robot is smart enough to convert to and from mixed units.
handyCalc is a powerful calculator with automatic suggestion and solving which makes it easier to learn and use. With almost all the features you can imagine on a calculator, waiting for you to explore.