Mac OS X comes with a built-in Calculator application that enables you to switch between the basic, scientific, programmer, or RPN modes, allows you to perform conversions to and from various units, and can work with up to 15 decimal places.

However, if you are looking for a more colorful alternative that can display the calculator tape on the side, and is able to deal with the most elementary operation, EasyCalculator might peak your interest.

The EasyCalculator user interface is represented by a single window where you get to perform the calculations and toggle the calculator tape panel. The EasyCalculator color palette comprises grey, red and purple, so it will look vivacious on your desktop.

The EasyCalculator window can be easily resized, yet you cannot adjust the calculator tape panel which can be frustrating since longer operations are saved on a single line.

Nonetheless, you can scroll horizontally to see the entire line, or place it on your clipboard and paste it in a text editor, or any other app that can handle the format.

Via the EasyCalculator Settings window, you can choose to place the calculator utility on top of all other apps, which means that you will be able to access it at all times.

You can adjust the window opacity, so you don’t have to reserve a particular desktop space only for the EasyCalculator app.

EasyCalculator is able to deal with elementary operations such as addition, subtraction, multiplication, or division. The calculator also comes with an undo tool, and can be used to calculate percents.

The EasyCalculator utility allows you to adjust the opacity of its window and keep it afloat on top of all other apps, which might be useful if you are scarce on desktop space.