Directory
Xata
Branch-native Postgres with CoW forks
Free tier + paidDatabases & backendxata.io
What it is
Vanilla Postgres 18 with copy-on-write branching: a branch of any size is created in seconds and stores only what changes. Idle branches hibernate and wake in about a second. Xata relaunched as a Postgres platform, replacing its earlier serverless data API product.
Why it earns a slot
A branch per coding agent or preview deploy costs cents — Xata quotes a thousand branches for a dollar. Useful when you want agents experimenting against production-sized data without any risk to it.
Know before you commit
The old Xata serverless platform and its 15GB free tier are gone; the current Postgres cloud has no permanently free hosted plan, only pay-as-you-go compute or self-hosting.
Neighbourhood
How Xata sits against the rest of the atlas — swaps, companions and the tools builders actually save alongside it.
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