Nir Eyal

The cold truth is that the best products don't always win. Many times it's - the products that have the ability to keep users coming back and using them without conscious thought and using them out of habit are the ones that keep us coming back.

The market for religious apps is fiercely competitive; searching for 'bible' in the Apple App Store returns 5,185 results. But among all the choices, YouVersion's Bible, funded by LifeChurch.tv of Edmond, Oklahoma, seems to be the chosen one, ranking at the top of the list and boasting more than 641,000 reviews.

When I have a creative insight, there is a high. I think back in the day, I made music as much as I did because it made me feel so good. I think you could argue that there is a creative addiction - but, you know, the healthy kind.