MixMyRide develops a multimodal Mobility as a Service platform, which has public transport as its backbone, and exploits carpooling and active mobility as opportunities to extend public transport networks. The platform is tested in three one-year long, large-scale real-world trials, run in the regions of Lugano, Winterthur, and Geneva. Its behavioural effects on mobility, energy demand, carbon emissions and more generally on living and working social practices are assessed through a mixed method approach.