Fig. 1From: A review and content analysis of engagement, functionality, aesthetics, information quality, and change techniques in the most popular commercial apps for weight managementFlow chart of the selection process for apps included in the review. Legend: a Apps that were downloaded less than 10,000 times. In Google Play, the category ‘Installs’ includes the information 15 levels ranging from “1–5” to “10,000,000–50,000,000”. A popularity index, based on the category of installs, was determined to estimate the number of downloads, as described in Garg and Telang’s formula [53]. b Apps that were downloaded less than 100 times a day, based on the rank of the apps. c Apps that received a rating below 4. d Apps that were classified as having “in-app purchases” (i.e., " freemium"). e Apps that addressed other health aspects different from weight management or related behaviours (diet and PA), such as smoking, mental health, pregnancy, etc. f Apps that were workout or activity tracking apps without the aim to weight loss. g Apps whose description was not in English. h Apps that did not have a respective counterpart on the other app store. i Apps that had more than one version (e.g., HD, lite, pro); the basic, fully-functional version was chosen. j Apps that required an external device (e.g., monitor, wrist band) to function. k Apps that were either free or paid but the paid version did not have additional and fully functional features. l Apps that were not available to download after the selection or that were not available for download on the respective devices iPhone 5S (iOS 9.0.2) and Samsung Galaxy S4, GT-I9505 (Android 5.0.2)Back to article page