NKJV, The New King's James Version, is a modern language update of the original King James Version (KJV). It retains much of the traditional interpretation and sentence structure of the KJV. I have bundled study tools with the app; namely:
1. Easton's Bible Dictionary: a reference work on topics related to the Bible
2. The Gospel Harmony Table: a compilation of the gospels of Matthew, Mark, Luke and John into a single tabular format
3. A series of very short Bible lessons that explores salvific doctrine. Plus, an accompanying Q&A -- exploring doctrinal concepts in a question and answer format
4. Notable Events of the Old and New Testament
5. Hitchcock's Bible Names: lists the meanings of more than 2,500 names in the Bible
NKJV Bible is completely free: no upsell, no ads, no subscriptions