Editor's Review
Reading a long book on a phone sounds like a compromise until you have tried it on a commute, and this app is the reason most people stop treating it as one. It is the reader for Amazon's ebook ecosystem, so anything you have bought, borrowed through a supported library system, or picked up as a free sample lands here and stays in step.
The typography controls earn the install on their own. Font, size, line spacing, margins, background tint and page-turn behaviour are all adjustable, so a page can be tuned for a bright train window or a dark bedroom. Whispersync keeps your furthest page consistent across phone, tablet and any e-ink hardware you own, and if you also hold the Audible edition of a title the app hands off between reading and listening at the same spot.
Around the text sit the tools that make study reading practical: a tap-and-hold dictionary, Wikipedia and translation lookups, highlights and notes that can be exported, X-Ray for tracking characters and recurring terms, and Goodreads integration for logging what you finish. Reading statistics track streaks and time spent, which some readers find motivating and others switch off within a week.
The catch is commercial rather than technical. App store rules mean the Android edition cannot sell you a book directly, so buying involves a trip to a browser, and newcomers find that genuinely confusing. Content is tied to one Amazon account and its regional store, so a library does not travel well if you move countries. The app has also grown heavy over the years, with a home screen that pushes storefront recommendations at readers who only wanted the next chapter.
Features
Reads purchased ebooks, magazines, samples and supported library loans in one library
Adjustable font, size, spacing, margins and page colour for comfortable reading
Whispersync keeps your furthest page aligned across phones, tablets and e-ink hardware
Switches between reading and the Audible narration of the same title
Tap-and-hold dictionary, translation and Wikipedia lookups without leaving the page
Highlights, notes and bookmarks that stay attached to the book
X-Ray summaries of characters, places and recurring terms
Goodreads shelves and reading time statistics built in
Pros
An enormous catalogue behind it, including borrowing through participating libraries
Reading position, notes and highlights follow you between devices
Text and brightness controls are far better than most reading apps offer
Titles work offline once they have finished downloading
Cons
Store rules prevent buying books inside the Android app
Books are locked to a single Amazon account and its regional store
The home screen pushes a lot of promotional content at you
Questions people ask
Why can I not buy books inside the app?
App store rules stop the app taking payment for content directly, so purchases happen on Amazon's website in a browser. Once bought, a title appears in the app's library automatically.
Do I need a Kindle device to use it?
No. The app is a complete reader on its own. Dedicated hardware only adds an e-ink screen and shares reading position with the app if you happen to own both.
Can I read files I did not get from Amazon?
Personal documents and supported ebook files can be sent to your library using Amazon's Send to Kindle service. Copy-protected files bought from rival stores will not open.
