Table 2.

Detailed information about mobile apps.

No.	Mobile app	Context	Short description of mobile app
1	ePASS	ePASS is part of the TXT2BFiT program, which consists of a booklet, a Web site, weight tracker, handouts, community blog, text messages, emails, personal coaching calls.	ePASS uses the target of moderate-level exercise for 30 minutes per day. Users can specify the type of activity and intensity and self-monitor their daily level of physical activity.
2	eVIP	eVIP is part of the TXT2BFiT program, which consists of a booklet, a Web site, weight tracker, handouts, community blog, text messages, emails, personal coaching calls.	eVIP allows users to monitor their daily intake of fruits and vegetables. A graphical display shows the number of fruits and vegetables the user recorded. As a reference, the app uses the targets of 2 servings of fruits and 5 servings of vegetables daily.
3	eSIYP	eSIYP is part of TXT2BFiT program, which consists of a booklet, a Web site, weight tracker, handouts, community blog, text messages, emails, personal coaching calls.	eSIYP allows users to specify the drink category (eg, water, tea or coffee, alcohol). The app presents users with a colored display with the total amounts of energy, sugar, and alcohol intake. The colors green, orange, and red indicate “ideal”, “acceptable”, and “too much” as threshold levels of intake, respectively.
4	eTIYP	eTIYP is part of the TXT2BFiT program, which consists of a booklet, a Web site, weight tracker, handouts, community blog, text messages, emails, personal coaching calls.	eTIYP allows users to specify the food and beverages consumed. A colored display shows the average energy and fat content of takeout meals, in which green indicates acceptable intake and red indicates excessive intake.
5	CHAT	CHAT used text messages to send users tailored feedback. Users are trained in using the app in advance and the app is currently developed to be used on an iPod touch.	CHAT provides users the ability to assess dietary intake (fruits, vegetables, junk food) by taking before and after pictures. Based on nutrition characteristics and volume estimation, tailored feedback and dietary recommendations are given regarding the estimated energy and nutrition.
6	MoSeBo/DiaTrace	The app is integrated in a structured treatment and teaching program (STTP) for overweight children and adolescents. The STTP consists of 28 therapeutic sessions in which personal goals are defined for each patient with respect to energy intake and physical activity.	The app consists of a built-in sensor that measures physical activity (mobile motion sensor, MoSeBo). The sensor measures the type, intensity, and duration of physical activity. The amount of physical activity is displayed on the display of the phone. With the camera (DiaTrace) eating habits are documented.
7	Ak-Shen app	i-Challenge! is an 8-week intervention that consists of an app and Web site and is part of a physical education class at junior high school. In a newsletter, a weekly i-Challenge! is delivered. An i-Challenge! is a small, fun, and challenging activity related to nutrition and physical activity intended to keep participants engaged in the project.	Ak-Shen app allows users to share activities with others. It consists of 3 components: 2 GPS-based mobile phone apps (GeoKnect and GeoSnap) and a social network, i-Challenge!. With GeoKnect and GeoSnap, the user can directly show on i-Challenge! what activity they do. With GeoKnect, a GPS-based feature, users can mark and describe points, lines, and areas of interest on a map. GeoSnap is a camera that captures photos and their descriptions and sends them automatically to the i-Challenge! Website.
98	MMM (My Meal Mate)	Users are also supported by tailored weekly text messages.	The MMM app allows users to set a weight loss goal and self-monitor daily calorie intake. Users select food and drinks consumed from a database and record items in an electronic food diary. Users can take photographs of their meals that serve as a memory aid. Physical activity can also be recorded in the diary.
9	Recaller	Not described.	Recaller is a nutrition assessment tool that allows users to take photos of all food eaten to improve diet awareness.
10	W8Loss2Go	Not described.	The app allows users to list and photograph their problem foods, with sequential withdrawal from each food. Furthermore, it includes a buddy and online community support.
11	FRapp	Not described.	FRapp is a food record app. It allows users to monitor dietary intake by taking before and after pictures of all foods and beverages consumed.
12	App-Hongu	The app is added to an 8-week online walking program that uses a Web site.	The app allows youth to report their walking miles.