Table 1.

Comparison of trackers on various criteria

Criteria	Withings Go	Misfit Ray	Fitbit Flex2
API Support	Yes	No	Yes
Group Challenges	Yes	No	Yes
Battery	Up to 6 months	Up to 4 months	Rechargeable (10 days approx.)
Data Caching (how often syncing is required)	10 days10 days	1 day	10 days
Connection with MyFitnessPal	Limited to nutrition	Unreliable	Yes
Sharing dashboard and accomplishments	Weight, blood pressure and BMI can be shared	No	Can share the dashboard to friends including steps and workout
Weight measurement	Yes	No	Can connect to a scale