Neon and hosted platforms only branch databases they own. Sprout branches the Postgres you already run — including Supabase. Connect once. Sprout keeps a live local replica, then ZFS/APFS copy-on-write spins a writable branch in about a second: full data, its own hostname, no extra prod replication slot. Open source and self-hosted. GitHub login isolates each teammate's connectors and branches on one VM. Reset or delete a branch when you're done.