Basemark OS II is a cross-platform "All-In-One" benchmark that evaluates the overall
performance of any Android iOS and Windows Phone 8 smartphones and tablets for
easy comparison.

Simply press "Run Benchmark" the tests will be started.

The benchmark covers a comprehensive suite of tests and produces
an objective overall score and group scores in five different areas including system
memory graphics web browsing and camera.

While the full version provides all the detailed score breakdown for further analysis which is meant for product development purpose the free version is designed for consumers which has the same workload as the full version but only displays the final score of overall performance and grouped area performance.

More information: http://www.basemark.com/product-catalog/basemark-os-ii/

You can check the performance of other devices and compare with your own on Basemark's official database Power Board which collects results from over 1500 smartphones and tablets. http://powerboard.basemark.com/