The Crowdville Mobile application implements "crowd-testing" features: the crowd-testing is a social way that allow people to check the usability and the correctness of some service or product provided by external companies: for example, the test of a video service offered in cloud. The app allows the user to participate to some testing campaigns, where some people (registered in the system also through the app) are involved: these people are known as "crowders". The crowders can insert their own profile information, see the list of published testing campaigns and participate to one or more of them. A crowder, that participate to a campaign can submit through the app some bugs regarding the service or product he/she is testing, and see the money amounts that Crowdville has recgnized to him/her: this recognition is done offline and the app allows just to see the values and ask for the payment (i.e. wire transfer). Then, the app shows the ranking of all the crowders, how many campaigns they participated and how many bugs the reported.