Windows Phone 7 is a mobile operating system developed by Microsoft, and is the successor to their Windows Mobile platform. It is aimed at the consumer market instead of the enterprise market like its predecessor.

Windows Phone features a new user interface, based upon Microsoft's Windows Phone 7 design system, codenamed Metro.

Android is a mobile operating system initially developed by Android Inc., a firm purchased by Google in 2005. Android is based upon a modified version of the Linux kernel.

Android has a large community of developers writing application programs ("apps") that extend the functionality of the devices. There are currently over 100,000 apps available for Android.