The Logos Bible Software app is the mobile version of the world’s leading Bible software. This free download comes with several Bible translations and other resources, and there are more than 100,000 books related to the Bible you can buy through the app. (This app features Luther's Works.)
This app is really cool if all you are looking for is a decent read through the Bible with with either the KJV or the tailor made Gideons version. Both are ok. However, the big perk here is that this app has free spoken versions. If you have problems reading, this app could help you.
Similar to the Logos platform, the Olive Tree Bible Study system has plenty for the Bible study geek to use for work, study, and devotion. There are thousands of books to read on this platform, many of the same books you'll find in Logos.