CITIZENLAB  is a cloud-based Software as a Service (SaaS) platform on which citizens co-create their city. The platform facilitates a two-way communication between the city and its citizens, and helps cities tap into the collective intelligence of citizens by matching the right urban challenges with the right citizens based on their expertise and/or interests, whilst enabling them to reach out to more citizens, to citizens it could not reach before (i.e. younger residents), and saves them resources as the CitizenLab software automatically analyses the citizens’ feedback and opinions vigorously.