Barnes & Noble now has four versions of it’s e-reader/table Nook on the market. The Nook Simple Touch with GlowLight is the same thing as the original Nook but with a brighter screen. But the recent releases of the Nook HD and Nook HD+ brought a world of differences to the Nook family. A world a differences that will call for extra testing. Let’s take a side-by-side look at the three B&N tablets courtesy of engadget:

The dimension, resolution and pixel density differences will undoubtedly be the biggest challenges for developers and testers trying to make sure apps work flawlessly on all three Nooks.