Int. J. Environ. Res. Public Health 2009, 6 510 Table 2. Health-related self-tracking websites and services. Service Trixie Tracker http://www.trixietracker.com MyMonthlyCycles http://mymonthlycycles.com Mon.thly http://mon.thly.info Ovulation.com http://www.ovulation.com BedPost http://www.bedposted.com Tweet what you eat! http://www.tweetwhatyoueat.com Zume Life’s Zuri http://www.zumelife.com Keas http://www.keas.com Function Track and display the activity patterns of babies; sleeping, eating, diaper changes, etc. (website) Track menstrual cycles, use fertility calendars (websites and smartphone (iPhone, G1) applications) Measure sex frequency, duration, quality (website) Maintain a food diary with updates through SMS text messages, instant messages or web input. Calorie count suggestions come from a crowd- sourced database (website) Generate medical reminders and track medication, biometrics, food, exercise and health status. Customized health tracking via a speech transcription service (website, device and iPhone application) Highly personalized full health and wellness profiles, ongoing lab results, custom questionnaires and interaction with physicians and other health providers (website, due to launch in 2009) The next step in quantified self-tracking health applications is wearable devices with automated data collection (Table 3). There are several devices with similar functionality. The basic feature is accelerometer-detected energy expenditure or calories burned. A second feature provided by some devices is sleep measurement. Most devices are wearable for about a week between battery recharges and require connecting to a computer, usually via USB, to upload the data. The FitBit, estimated to launch in early 2009 will send the data wirelessly to a computer-attached base station. Table 3. Wearable self-tracking devices with automated data collection. Product Functions Connectivity Pricing Availability FitBit Energy Wireless $99 one-time fee Available Q1 http://www.fitbit.com expenditure, sleep including device + 2009 2 inch belt unit measurement ongoing website access GoWearFit Energy USB $159.95 + Available http://www.gowearfit.com expenditure, sleep $6.95/month website now Arm band + display watch measurement subscription fee Bodybugg Energy expenditure USB $249 + $14.95/month Available http://www.bodybugg.com website subscription now Arm band + display watch fee Energy expenditure USB $99.95 WalkingSpree http://www.walkingspree.com Pedometer ActiHealth http://www.actihealth.com Tanita http://www.tanita.com/ radiowirelessscales.shtml OrSense http://www.orsense.com Kickbee http://portfolio.menscher.com /itp/kickbee Blood pressure, weight, activity Wireless bathroom scales Non-invasive spot and continuous glucose monitoring Tracking of baby kicks from the womb USB, Bluetooth Bluetooth Manual Sensor, Bluetooth $130 pedometer $249.99 Available now Not available Available now Not available yet yet Not available commercially