For a single permit lookup or anything requiring official confirmation — issuance, occupancy sign-off, final inspection — the EPIC-LA is the source of record. Go directly to the Los Angeles County portal for those.
For ongoing monitoring across multiple Los Angeles County 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 Los Angeles County 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 EPIC-LA is always the system of record; SignedOff is a monitoring layer on top of it.