For a single permit lookup or anything requiring official confirmation — issuance, occupancy sign-off, final inspection — the Simi Valley Customer Self Service (EnerGov) is the source of record. Go directly to the City of Simi Valley portal for those.
For ongoing monitoring across multiple Simi Valley 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 Simi Valley 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 Simi Valley Customer Self Service (EnerGov) is always the system of record; SignedOff is a monitoring layer on top of it.