ET Picks: Best Phone and Tablet Apps

SmartFuel

iPhone; $0.99/month subscription

Punch in a destination up to 100 miles away, and SmartFuel will tell you where to stop for the cheapest gas along the ride—or just tell you where to find gas nearby.

FitnessBuilder

iPhone/iPad; $9.99 and up

This workout app contains more than 750 exercises and 5,600 photos and videos, and pros can find much more with in-app upgrades: You can ask physiologists about your routine, and therapists can use the app to send rehab regimens directly to clients.

Golfplan with Paul Azinger

iPhone/iPad; $0.99

Work on your golf game with practical advice from this PGA pro. In-app purchase ($1.99) gives you indoor practice drills for the office.

WebMD

iPhone/iPad/Android; free

Hypochondriacs, unite! Now you don’t even need to search the web to determine that you have a tumor: Your phone can tell you.

Xobni Super Address Book Pro

BlackBerry; free - $1.99

This awesome contact management and email search add-on for Outlook also works with BlackBerry mail. iPhone and Android versions are en route.