Calorie Tracker LiveStrong Demand Media Inc. Cost: $2.99
People following the popular LiveStrong health and fitness program will like this calorie-tracking app. Use it to look up nutritional information on the food you're about to eat, and keep track of daily calories, fat, carbs, and protein using the service's Daily Plate database. Also use Calorie Tracker to log calories burned by exercise. The app is a companion to LiveStrong's free Web service, with two-way synch, but the app works even when you're offline.
Weight Watchers Mobile Weight Watchers International Cost: $29.95 sign-up, plus $16.95 per month
The 46-year-old behemoth-among-weight-loss programs recently released an iPhone app, allowing users to track food and exercise, search food options, find nearby meetings, and calculate nutrition and exercise value based on Weight Watchers' trademarked "points" system.
The app won't win many new converts to Weight Watchers. It requires a network connection, and, while the app itself is free, it requires a Weight Watchers subscription to work, and the subscription is pricey.
Still, the app is potentially a valuable tool for iPhone and iPod Touch users who are already "on program."
soundAMP Ginger Labs Cost: $9.99
soundAMP turns your iPhone into a hearing aid. It's designed for students looking for a hearing boost in a lecture hall, and hearing-impaired people looking to participate in conversations.
The software amplifies soft sounds and softens loud sounds, providing clarity at all volume levels with minimal distortion, the vendor says. It uses the iPhone's built-in microphone for input. On-screen controls let you adjust the volume and modify the tone, and the software even works like a TiVo for real life -- a "repeat" button lets you play back what was just said.
Now hear this: While the App Store rating gives soundAMP a good overall rating, three out of five stars, nine of the 18 reviews are one-stars, with seven five-star reviews. However, the vendor says that it recently released a new version, it's popular among the hearing disabled, and Apple itself is promoting the app.