WebMD Not sure if you have the flu? WebMD's ( WBMD) "symptom checker " will help you figure out what's wrong with you. Tap the mannequin to highlight the body parts that are troubling you the most. After reading about all the worst case scenarios, you'll probably be tempted to call a doctor. (Chances are you're not dying). Fortunately, the app can help you with that, too. Use location-tracking to find a local physician or hospital. You can also keep track of your medications with a free registration to a WebMD account. The free app is compatible with iPhone, iPod touch, and iPad, but requires iOS 3.0 or later. It's also available on Android.