Table 3.
Positive and negative attributes of usability from the System Usability Scale of the 11 apps selected for evaluationa.
| Attributes | Bitesnap | MyFitnessPal | Cronometer | MealLogger | FoodView | MyPlate | MyCircadianClock | Macros | DiaryNutrition | DietDiary | FoodDiary | |
| Positive attributes | ||||||||||||
|
|
Would use app frequently | 4.5 | 2.5 | 3 | 1.5 | 1.5 | 2.5 | 1 | 3.5 | 2 | 2 | 1 |
|
|
App was easy to use | 5 | 3.5 | 4.5 | 4.5 | 5 | 4.5 | 3 | 4.5 | 3 | 5 | 4 |
|
|
Various functions were well integrated | 4 | 3.5 | 3 | 2.5 | 4.5 | 4 | 3 | 4.5 | 5 | 4 | 3 |
|
|
Most would learn to use very quickly | 4.5 | 3 | 3.5 | 4 | 5 | 4.5 | 2 | 4.5 | 4 | 5 | 4 |
|
|
Felt confident using the system | 5 | 4 | 4 | 4 | 5 | 5 | 4 | 5 | 5 | 5 | 5 |
| Negative attributes | ||||||||||||
|
|
Found app unnecessarily complex | 1 | 3 | 2 | 1.5 | 1 | 1.5 | 4 | 1.5 | 1 | 1 | 1 |
|
|
Would need support of technical person to use | 1 | 1 | 1 | 1 | 1 | 1 | 1.5 | 1 | 1 | 1 | 1 |
|
|
Too much inconsistency | 1 | 1 | 1.5 | 1.5 | 1.5 | 1 | 2 | 1.5 | 1 | 1 | 1 |
|
|
Found app very cumbersome to use | 1 | 3.5 | 3 | 2.5 | 1 | 1.5 | 4.5 | 1.5 | 2 | 1 | 2 |
|
|
Needed to learn a lot of things before using app | 1.5 | 1 | 1 | 3 | 1 | 1 | 3 | 1 | 1 | 1 | 1 |
aSystem Usability Scale scoring on a scale of 1 (strongly disagree) to 5 (strongly agree).