CitizenLab (https://www.citizenlab.co) is a civic engagement platform on which citizens co-create their city. The platform facilitates a two-way communication between the city and its citizens. Citizens post ideas, interact on them and upvote the best ideas. On the other hand, the city uses CitizenLab to consult the opinion of its citizens via polling or to ask their creative solutions to an existing problem. Our SaaS solution is the medium for cities to make decision-making more democratic, more transparent and more collaborative through citizensourcing.