IT architects often face high uncertainty and a lack of methodical support when it comes to architectural decisions in emerging IT environments. Here, a capability-based approach can help to ensure business-orientation and strategic alignment. However, in practice, it turns out to be difficult to identify relevant capabilities and adequate architectural possibilities. The prototype presented in this proposal constitutes a web-based software tool to support the exploration of capabilities and link them to architectural decisions. For this, the software allows (i) the definition of environmental setups for certain application areas (e.g. capabilities and architectural possibilities for the internet of things) and (ii) the application to certain use cases (i.e. the analysis of the IT landscape and the exploration of relevant capabilities and architectural possibilities). The prototype is part of overarching research and was developed and used to explore the area of distributed analytics systems.