For a single permit lookup or anything requiring official confirmation — issuance, occupancy sign-off, final inspection — the San Diego DSD is the source of record. Go directly to the City of San Diego portal for those.
For ongoing monitoring across multiple San Diego permits, a third-party service such as SignedOff reduces manual portal logins and surfaces status changes by email. The typical use case is a contractor, architect, or project manager with several active San Diego jobs at different stages — plan check, inspection, close-out — where logging into the portal daily for each one isn't practical.
Both tools draw from the same underlying permit record — the San Diego DSD is always the system of record; SignedOff is a monitoring layer on top of it.