Verdict: The YouVersion Bible app is best for readers who want to find and follow interesting topic plans from their favorite authors and Bible teachers.

While YouVersion may not be an investment opportunity for venture capitalists, it has benefitted from some of free advice. Kleiner Perkins partner Chi-Hua Chien has helped mentor LifeChurch.tv.

(RNS) — This month the free app surpassed 500 million downloads. That's equivalent to one-sixteenth of the world's population.