It announced its newest Kindle, which is waterproof, earlier in October. Amazon, however, claims last year was its best year for Kindle sales yet.

According to Euromonitor, e-reader sales peaked in 2011 and have declined more than 40% since then. If you don't use Goodreads, you can still see activity here from popular reviewers or authors.Į-readers are dropping in popularity. You can see or share notes or highlights, and then comment on them. A tab shows an information feed about what your friends are reading and reviewing. The new social features on the Kindle app are meant to keep people flush with reading recommendations. Related: Amazon finally made a waterproof Kindle

Amazon Prime members have access to more than 1,000 books and magazines through the app.

Kindle Unlimited subscribers, who pay $10 a month, can download millions of e-books. Meanwhile, Android app users continue to be able to buy e-books through the app. Mike Torres, a Kindle product director at Amazon, said the company is still waiting on acceptable business terms from Apple before it can add the feature.

Kindle apps