Both the Kindle Paperwhite and the Barnes & Noble Nook GlowLight are e-book readers designed to emulate the look of a real book. Differences between the two range from the Kindle having more contrast and a brighter screen to the Nook using a more universal e-book format.
Several e-book readers use Nook's "epub" format, making it more universally accepted than Kindle's "mobi" format. The "epub" format is especially helpful for readers who like to purchase their e-books from multiple sites such as Sony or Google Books. Amazon limits books Kindle owners can read to the "mobi" format, meaning that for the most part, Kindle owners must purchase their books from Amazon or search for "mobi" format books.
Both the Kindle Paperwhite and the Barnes & Noble Nook have a crisp clear display, which makes reading an e-book easy on the eyes. However, the Paperwhite seems to have a slightly brighter picture and higher contrast ratio, making the text look more crisp and clear. The light on the Paperwhite is brighter and a little less blue than the light on the Nook, according to Digital Trends. The Paperwhite has tap zones that are designed for easy page-turning and the Nook is more awkward in that area.