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Supabase vs Xata

Supabase scores higher on the AgentReady, 74/100 against 70/100. They differ on 15 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Supabase. Supabase is an open-source Firebase alternative that provides a complete backend platform built on top of Postgres, offering database, authentication, storage, realtime, edge functions, and vector capabilities.

Xata. A Postgres platform with instant branching and scale-to-zero compute.

Where Supabase is ahead

Supabase passes authentication documented, and Xata does not. That is understand, whether an agent can read the docs and work out how the API behaves before calling it.

Where Xata is ahead

Xata passes search discoverable, clear canonical domain and public docs discoverable, and Supabase does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: pricing understandable. Supabase misses it.

And on adopt, self-service signup, no mandatory sales call, free trial or free allowance, fast time to first request, copyable quickstart, official typescript sdk and official python sdk. Supabase misses those.

Finally, on operate, canonical workflow succeeds, observable execution and agent compatibility verified. Supabase misses those.

What neither does

Both fail openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented, programmatic credential creation, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable. If your agent needs any of those, you will be building it yourself either way.

Score, pillar by pillar

The AgentReady splits into four pillars, scored separately, because a product can be easy to find and still impossible to adopt.

Discover. Both sit at 100/100 here. Supabase misses search discoverable, clear canonical domain, public docs discoverable; Xata misses nothing.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. Supabase leads 67 to 38. Supabase misses openapi / spec quality, pricing understandable, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; Xata misses openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Xata leads 90 to 63. Supabase misses self-service signup, no mandatory sales call, programmatic credential creation, free trial or free allowance, fast time to first request, copyable quickstart, official typescript sdk, official python sdk; Xata misses programmatic credential creation.

Operate. Supabase leads 67 to 53. Supabase misses canonical workflow succeeds, structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, observable execution, agent compatibility verified; Xata misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable.

Pricing

Supabase does not publish a machine-readable starting price. Xata starts at $0.012/hr and has a free tier.

Signal by signal

Which to pick

Xata clears more of the signals an agent needs, so it is the safer default for unattended use. Full profiles: Supabase and Xata. Alternatives to each: Supabase, Xata.

An agent can fetch this as data: POST /v1/compare {"slugs": ["supabase", "xata"]}