I have become enamored with the Timeline in Logos 6. Thye only downside is that it is only available in the desktop software. I would love to have this wonderful tool available on my iPad, too. I think it might best work as a stand alone app, but integrating it into the Bible! App would also be great.
BTW, I recommend getting the Timeline Collection. It has added significant value to my use of Logos 6.
https://www.logos.com/product/49357/timeline-collection#105
