Urban biodiversity plays an important role in every day’s life. It influences not only physical and social health of inhabitants, but also water drainage, microclimate regulation, air quality, and thus has an economic value. The assessment and improvement of biodiversity in urban spaces does not only depend on the decisions of politicians, but to a high grade on the attitude and on the actions of citizens. In this article we discuss how citizens may be motivated to both contribute in biodiversity monitoring through two different geospatial applications and to take action for improving biodiversity in urban space.