Background
Evaluating the quality of mobile health apps for weight loss and weight management is important to understand whether these can be used for obesity prevention and treatment. Recent reviews call for more research on multidimensional aspects of app quality, especially involving end users, as there are already many expert reviews on this domain. However, no quantitative study has investigated how laypersons see popular apps for weight management and perceive different dimensions of app quality.
Objective
This study aimed to explore how laypersons evaluate the quality of 6 free weight management apps (
My Diet Coach
,
SparkPeople
,
Lark
,
MyFitnessPal
,
MyPlate
, and
My Diet Diary
), which achieved the highest quality ratings in a related and recent expert review.
Methods
A user-centered study was conducted with 36 employees of a Lebanese university. Participants enrolled in the study on a rolling basis between October 2016 and March 2017. Participants were randomly assigned an app to use for 2 weeks. App quality was evaluated at the end of the trial period using the Mobile App Rating Scale user version (uMARS). uMARS assesses the dimensions of
engagement
,
functionality
,
aesthetics
,
information
, and
subjective quality
on 5-point scales. Internal consistency and interrater agreement were examined. The associations between uMARS scores and users’ demographic characteristics were also explored using nonparametric tests. Analyses were completed in November 2017.
Results
Overall, the 6 apps were of moderately good quality (median uMARS score 3.6, interquartile range [IQR] 0.3). The highest total uMARS scores were achieved by
Lark
(mean 4.0 [SD 0.5]) and
MyPlate
(mean 3.8 [SD 0.4]), which also achieved the highest subjective quality scores (
Lark
: mean 3.3 [SD 1.4];
MyPlate
: mean 3.3 [SD 0.8]).
Functionality
was the domain with the highest rating (median 3.9, IQR 0.3), followed by
aesthetics
(median 3.7, IQR 0.5),
information
(median 3.7, IQR 0.1), and
engagement
(median 3.3, IQR 0.2).
Subjective quality
was judged low (median 2.5, IQR 0.9). Overall,
subjective quality
was strongly and positively related (
P
<.001) with total uMARS score (ρ=.75),
engagement
(ρ=.68),
information
, and
aesthetics
(ρ=.60) but not
functionality
...