Stingmapper is a collaborative mobile app designed to combat invasive hornets and protect biodiversity across Europe. By enabling citizens to report hornet nests on an interactive map and connecting them with professional pest control services, the app helps ensure faster and more effective nest removal. Beekeepers can register their apiaries for free and receive alerts when a hornet nest is detected nearby, allowing them to take action and prioritize threats to their colonies. By centralizing reports and interventions across borders, Stingmapper contributes to a coordinated European effort against invasive hornets while providing valuable data to scientists and public authorities to better understand and manage their spread.