This contribution provides insights from one of the four social innovations of the INNOVAGE project, focused on the development of the InformCare web platform for supporting informal caregivers of older people in Europe. The platform included information resources on different topics (major diseases in older age, public care services and benefits, coping and reconciliation strategies etc.) and interactive services for professional and peer support (dedicated social network, forum, chat and videochat). The design phase was based on a consultation process involving almost 200 stakeholders and on user tests. The pilot phase was carried out as a mixed-methods study in Germany, Italy and Sweden, which recruited totally 118 caregivers who could access the InformCare platform for 3 months. Positive findings led to its refinement and implementation in 27 European countries. Today, the platform is publicly accessible (www.eurocarers.org/informcare) in 32 versions and 23 languages, with over 2,500 web pages for informal caregivers.