This one is surprisingly good. It supports many formats, like fb2, epub, pdf, and more, malfunctioning at times, but the developers are working hard to SD card, cloud, or browser without any ads.
Tap the Aa icon to change the font style and text size, page color, and how compact the text is arranged on the page. Go to support page. Pick up from where you left on a totally different device as the app syncs and remembers the furthest page read, bookmarks, notes and highlights with the help of Whispersync technology. Kindle allows you to download books to read offline, which is perfect for travelers or anyone wanting to enjoy their books without relying on an Internet connection.
