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We present a framework for collecting and analyzing mobile users' data. We have built our own framework in order to fulfill specific tracking requirements such as app usage and affect/mood recording. We incentivize the users to share their data through giving feedback. The UX and the interface are primary concerns in our Android app. To be able to process large amounts of data we developed our analysis platform using a modern big data stack. The framework has been deployed in a large scale longitudinal experiment since January 2014. It has attracted more than 400, 000 app installs and more than 350, 000 registered participants.
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Andone et al. (2016) studied this question.