Arguably, Persona and Parse more than overlap: the supported user base of Persona is a proper superset of Parse's actual and potential user bases. :) Persona w

Arguably, Persona and Parse more than overlap: the supported user base of Persona is a proper superset of Parse's actual and potential user bases. :) Persona works with any email address, and it's completely decentralized (albeit with a temporary, centralized fallback for bootstrapping)