The Watchtower library of the Jehova's Witness church has an app available for downloads to all Apple mobile devices running iOS 6.0 or later, as of 2015. The app is optimized to work best with iPhone versions 5, 6 and 6 plus.
The Watchtower Library app is available in English, American Sign Language and over 75 other language options. It includes books and brochures for bible study as well as 6 other biblical translations. Users can compare the translations and access footnote markers, reference letters and other associated material. JW Language is an additional app also available on iTunes that provides additional language translation instruction for those interested practicing ministry.