The Food Supply Chain (FSC) app is a web-based application originally developed within the FoodRUs project and subsequently adapted and reused in the ToNoWaste Horizon Europe project. The tool supports companies in the systematic quantification, monitoring and improvement of food loss and waste (FLW) prevention and management across the food supply chain. Many food-related organizations face practical challenges in identifying FLW hotspots, assessing food loss and waste in relation to production or sales volumes, and assessing the effectiveness of FLW prevention actions. The FSC app addresses these challenges through a structured and operational digital solution focused on real-world application.