Withings WiFi Body Scale, iOS, AndroidWithings
Follow your weight curve, any time, any place. The Wireless Scale is Wi-Fi enabled to measure and record your weight every time you step up on it. You can track changes in your mass and estimated body mass index over weeks, months and years. Data is saved on a private password-protected site and can be accessed anywhere from a computer, tablet or smartphone. If you're particularly brave, you can even have the scale "tweet" your weight to Twitter automatically!