Kevin Richardson's favorite apps involve baby, sleep

• The Backstreet Boys go on tour starting Aug. 2 in Chicago
• Kevin Richardson recently traded in a pregnancy app for a fantasy football one
• White-noise app Sleep Pillow is a favorite on the road

Kevin Richardson of the Backstreet Boys and wife Kristin welcomed their second son, Maxwell Haze Richardson, on July 10. So for the past nine months, Richardson has been a regular user of iPregnancy, a pregnancy-planning app that tracks baby development, calculates due dates and provides information for expectant parents.

"You tap on it, and it tells you exactly what's happening," Richardson says. "You type in all the variables, you narrow down when your wife got pregnant, then, daily, it tells you what's going on in there. I've always loved science and biology, so it's cool to be able to track it like that."

Since the arrival of young Max, Richardson has deleted the pregnancy app in favor of something more forward-looking: NFL.com Fantasy Football 2013.

With the July 30 release of new album In a World Like This, Richardson's first with the group since 2005's Never Gone, and a tour starting Aug. 2 in Chicago, Richardson also plans to make good use of Sleep Pillow, a white-noise app.

"It's got an ocean sound, a fan, New York street traffic, a flowing stream," he says. "When I'm in a hotel room, I need a little bit of noise. That helps me sleep."

The one sound Sleep Pillow doesn't have that a musician could use? A running bus. "Maybe I should recommend that."