For me, though, these devices are meant for one thing. Help me read more books. Buying ebook readers might seem simple, but ...

For less than the cost of buying one book a month, Amazon's Kindle Unlimited gives you access to millions of ebooks and thousands of audiobooks. Looking to read some books on your iPhone or iPad?

It also supports Audible's audio format, AAX. Nook devices support EPUB, PNG, JPG, GIF, BMP, and PDF file formats. Despite the differences between Kindle and Nook devices, it is possible to read books ...