Mosquito Alert is a project coordinated by CREAF, CEAB-CSIC and ICREA in the fight against the spread of tiger mosquitos and yellow fever mosquitos, two invasive species that can transmit global diseases such as Zika, dengue fever and chikungunya. With the Mosquito Alert app, any person can notify discoveries of these mosquitos where they breed in public areas by sending a photo and the relevant information. This data complements scientific work and public health management in the detection and reduction of these mosquitos.