Most importantly, it comes with a six-month subscription to Amazon Kids+, which gives your kids unlimited access to books appropriate for readers 3-12. After six months, you'll have to pay $5.99 a month for the subscription, but you can cancel anytime.

Apple has appealed the decision, but is also complying with it in the interim, prompting several companies to announce app updates making it easier for users to pay for subscriptions and services. That now includes Amazon’s iOS Kindle app.

Amazon is the latest developer to take advantage of Apple's court-mandated App Store changes, and has finally made it possible to buy books directly in the iPhone Kindle app.