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While a wide range of disaster apps are currently available, few address the topic of CBRNe (Chemical, Biological, Radiological, Nuclear and explosive) risks and threats. The proven value of disaster apps in emergency management and the unique ways in which citizens prepare for and respond to CBRNe incidents merit that such an app exist. However, disaster apps also have their limitations, namely uptake and accessibility. The PROACTIVE project is filling these gaps by co-creating together with vulnerable groups an accessible CBRNe disaster app. This article examines the results from four workshops held with the potential end-users recruited from vulnerable groups. Following the MoSCoW methodology, requirements were established and their relevance to the Universal Design principles discussed. For instance, it was found that the app Must have a less chaotic interface which would help meet the principle of simple and intuitive use. Lastly, the app redesign is showcased.