80 percent of the most popular health applications available on Android do not comply with standards intended to prevent the misuse and dissemination of user data. This is the finding of a European study started in 2016 involving Agusti Solanas and Constantinos Patsakis. The research has brought to light evidence of serious security problems regarding the 20 most popular applications on the internet. The research consisted of analysing the security problems, communicating them to the software developers and then checking them to see if they had been resolved.