  Mobile devices, specifically, smartphones proved easy and quick access to
data visualisations throughout various tracking apps. Mobile health (mHealth)
apps have given non-expert users access to data visualisation to track their
activities and health-related issues such as heart tracking and medication.
However, no work is done on user experience or perception of data
visualisations in mHealth apps. App reviews offer an indirect anchor for
researchers to examine how non-expert users perceive and interact with data
visualisations and identify the key challenges and recommendations. This paper
introduces an analysis of app reviews on data visualisations reported on a
dataset of 250 mHealth apps on the Google Play Store. We identified 8,406
comments related to data visualisations. 919 neutral comments, 1,557 negative
comments and 5,930 positive comments. From analysing the user reviews,
functional requirements turned out to be the most common problem across these
app reviews, followed by the look and feel and then data problems. A complete
set of data visualisations seem to be the most well-received capability of
mHealth apps. We used these comments to develop classification and data
visualisation guidelines when developing mobile data visualisations.
