This paper reports on a collaborative action research project which sought to combine the knowledge and expertise of multiple specialist organisations with the understanding and insight of young homeless people in order to find digital ways of supporting them before they became homeless. We discovered that adopting a collective approach to the demands of digital innovation enabled us to develop precise hypotheses and resulted in mobile apps for young people targeted at specific moments of emotional and practical need. The action research project is reflexively analysed in seeking to understand this process of collective digital innovation.