Applications made available to citizens on their smartphones are designed to change the relationship between institutions and citizens. Their scope depends on the stakeholder involved – local authority, company, or citizen initiative. Similarly, the diversity of systems influences the way the applications change the public space. Cerema has drawn up a panorama of these tools to gain an understanding of their objectives and their impact on the public space. Systems are grouped in five categories: touch screens and mobile panels, citizen participation in urban space development, citizen initiatives, production of data designed to transform the public space and alternative use of public spaces.