Turn your  iPad into a Kindle with the free Kindle app. 

The iPad Kindle App, in my opinion, is far superior to an actual Kindle device in many ways: The large screen, multitude of font styles, rotatable viewing, adjustable screen brightness and page colour
and having it on a multi-function device works!

eBooks (including those with narration) that you have purchased on Amazon will automatically appear in your app.  Kindle Unlimited and Amazon Prime members can select and download eBooks directly in the app. 

If you're considering whether to purchase an iPad or Kindle, get an IPAD - it does much, much, much more than it's small, but cute, little rival eReader.