This free personal trainer tracks your outdoor fitness routines via the smartphone's GPS technology. While walking, jogging, running or cycling, all your times, distances, speeds and calories are recorded and tracked. Plus, your friends can follow your exercise in real-time and send words of encouragement while you're exercising. (Android, Blackberry, iPhone)
Place your finger over the LED camera, and in 10 seconds you'll know how fast your heart is beating — no external hardware needed, as the camera actually watches your blood pulsing. The basic app is free, but an upgraded version (99 cents for Apple, $2.99 for Android) allows you to customize an exercise routine and track your progress, and includes a target heart-rate zone calculator. (Android, iPhone) (PM)
23. Eye Chart Pro
You don't need great eyesight to see why the free Eye Chart Pro was the top downloaded medical iPad app in 2011. Eye Chart Pro is a visual acuity exam that's completely randomizable, therefore you can't memorize the chart like at your eye doctor's office. Tap the screen to randomly generate the eye chart or an individual line, and toggle between Snellen and Tumbling E charts. Directions are included on how far back one should sit before reading the letters on the tablet display. (iPhone)
24. WebMD
As with its website, the WebMD app for delivers trusted health information to your fingertips. Look up symptoms and side effects, access an extensive database of drug information, and search or browse through a comprehensive guide to medical emergencies — even without an Internet connection. If needed, you can also look up nearby physicians, hospitals and pharmacies based on your location. (Android, iPhone)
25. White Noise Lite
If you're having trouble falling asleep, the free White Noise Lite app might be just what the doctor ordered. Simply select from 10 soothing sounds — such as a rainstorm, chirping crickets, wind chimes or waves crashing on a beach — and you might be sound asleep before you can say, "Wow, this app is really relaxing." The free download also features a timer that automatically turns it off after you drift off. A premium version offers additional sounds. (Android, iPhone)
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