Districts with expansive school choice must decide how to match students and schools. Increasingly, districts are centralizing applications on one-stop portals that feature information about schooling options, admission requirements, and a single application and deadline with the hope of increasing transparency and streamlining the enrollment process. After Chicago Public Schools introduced a centralized platform (GoCPS), students were more likely to enroll in high-performing high schools, although this continued as a pre-existing upward trend. Enrollment declined slightly at charter schools and increased at neighborhood schools, mirroring shifts in applications. GoCPS reduced the number of admission offers, likely lessening uncertainty around ninth-grade enrollment. Districts implementing similar systems should consider the availability of seats at high-demand schools and reduce barriers to navigating choice systems.