Fig. 3

7-point Likert scale responses on the usability of the FoodFlip© smartphone application. Usability was defined as the ‘quality of user interface’ which assesses the user satisfaction and user engagement with the app. Four statements were used in assessing the usability features of the app: a ‘the product search feature was easy to use’, b ‘I liked the barcode scanner feature (if you used this feature)’, c ‘the app was easy to use’ and d ‘the app was confusing’. 7-point Likert scale ratings corresponded to completely disagreed (1) to completely agree (7)