REACT (Rapid Ecological Assessment and Communication Tool) is a plug-and-play environment that can be setup for every river basin in the world. The tool aims at combining publicly available global datasets, tools and models with ecological knowledge to offer an ecological quick scan of the fluvial system. The high level of abstraction calls for approaching ecological indicators as species groups with specific trait sets (i.e. trait strategies) instead of individual species. The level of ecological indicators also fits the aim of the tool: facilitate discussions with stakeholders early in the process to quickly identify potential bottlenecks in the abiotic and biotic system and to start thinking about scenarios and strategies targeted at designing E-Flows. Moreover, early involvement of stakeholders can aid in finetuning model input by more detailed data and knowledge.