A stark mobility divide separates American households with and without cars. While households with cars move easily across space, households without cars face limited access to opportunities. But no longer. Ridehail companies such as Uber and Lyft divorce car access from ownership, revolutionizing auto-mobility as we know it. Despite its high-tech luster, we do not yet know how ridehailing serves different neighborhoods and travelers, and who, if anyone, is left behind. The closest historical analog to new ridehail services is the taxi industry, which has a history of discrimination, particularly against black riders and neighborhoods. Ridehail services may discriminate less than taxis and extend reliable car access to neighborhoods underserved by taxis. Or they may not.