Digital technologies can play a key role in enabling circular economies by facilitating new information flows. A literature review identified benefits, requirements and barriers to digital solutions at the micro, meso and macro levels. At the micro level, implementations often have original goals other than circularity, but circular achievements can be byproducts. Micro solutions are building capabilities for meso-level multi-firm networks, but data sharing issues around control, value and access need solutions. While governments strongly support circular economies, the role of public digital solutions remains unexplored in the literature. More empirical research is still needed, especially around business ecosystems and the public sector's role.