Participedia is a collaborative, digital learning tool for the co-production of knowledge about new forms of citizen participation across the world (www.participedia.net). In this paper, we analyse using the platform as a learning resource for adult learners who are democracy practitioners and for undergraduate students. We examine Participedia's role in advancing transformative civic and democratic learning, and situate our analysis in the current context of democracy and civic space under strain globally. We argue that this pedagogy is crucial in the face of democratic erosion, growing inequality, increased polarization and the rise of right-wing populism. We discuss how Participedia's multiple channels for learner engagement (e.g., critical case study analysis, self-directed research, reflective writing, case study development based on lived experience, collaborative fellowships) support critical and reflective democratic practice. We show how the Participedia platform contributes to transformative learning outcomes, in particular around social action, active citizenship, participation and democracy.