This article maps the parameters of an emerging field of struggle around “openness” pertaining to digital data in the postcolonial smart city. Whereas colonial governance operated in relative secrecy with archives not quite available to ordinary citizens, what do we make of current institutions from government departments to banks flaunting their commitment to Open Data? Looking at data activism in Hong Kong, this article highlights the (post)colonial histories that have shaped the reception of Open Data in this context. More so, it explores the ways in which the techno-materialities of data infrastructures affect and reconfigure postcolonial struggle. Building on Kelty’s discussion of “recursive publics” and Hui’s account of recursivity, my notion of recursive politics underscores the mutuality of social history and techno-materiality. While recursive politics can contribute to technodiversity, I analyze how such politics weigh up against the political and ethical investments of postcolonial struggle.