Tackling alien species (AS) demands international collaboration, harmonization and sharing of data. The European Alien Species Information Network (EASIN) is committed to this aim, as the official information system assisting the European Commission and the European Union (EU) Member States with the implementation of the EU Regulation 1143/2014 on Invasive Alien Species (IAS). Citizens can provide a substantial contribution by reporting the sighting of IAS identified as of Union concern, according to the EU Regulation, supplementing Member States Competent Authorities surveillance systems. The JRC, within the framework of MYGEOSS initiative devoted to citizen science, has developed an application for Apple and Android devices called “Invasive Alien Species Europe”, allowing users to report the presence of the 37 species currently listed as of IAS of Union concern on the European territory. User friendly factsheets and pictures guide the user towards the species likely to have been observed. Once validated, data will be fed into the EASIN system. The App can be freely downloaded from Google and Apple Store.