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PlanetScale vs Powersync

PlanetScale scores higher on the AgentReady, 64/100 against 50/100. They differ on 8 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

PlanetScale. PlanetScale provides the world's fastest and most scalable cloud databases, offering fully-managed Vitess and PostgreSQL clusters with exceptional speed, reliability, and horizontal scalability through sharding.

Powersync. PowerSync is a sync engine that consists of two components: a service that enables high-scalability partial data syncing and a set of client SDKs that manage client-side persistence, consistency, reactivity and syncing write operations back.

Where PlanetScale is ahead

PlanetScale passes mcp discoverable, and Powersync does not. That is discover, whether an agent can find the product at all without being told it exists.

It also holds understand: structured api reference and authentication documented. Powersync misses those.

And on adopt, copyable quickstart and mcp integration available. Powersync misses those.

Finally, on operate, agent compatibility verified. Powersync misses it.

Where Powersync is ahead

Powersync passes self-service signup and free trial or free allowance, and PlanetScale does not. That is adopt, whether an agent can get a key and make its first successful call without a human in the loop.

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, fast time to first request, official python sdk, 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. PlanetScale leads 100 to 87. PlanetScale misses nothing; Powersync misses mcp discoverable.

Understand is whether an agent can read the docs and work out how the API behaves before calling it. PlanetScale leads 46 to 23. PlanetScale misses openapi / spec quality, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented; Powersync misses structured api reference, openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented.

Adopt. Both sit at 55/100 here. PlanetScale misses self-service signup, programmatic credential creation, free trial or free allowance, fast time to first request, official python sdk; Powersync misses programmatic credential creation, fast time to first request, copyable quickstart, official python sdk, mcp integration available.

Operate. PlanetScale leads 56 to 35. PlanetScale misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable; Powersync misses structured, predictable output, machine-readable errors, retry behavior documented, idempotency support, rate-limit behavior predictable, agent compatibility verified.

Pricing

PlanetScale starts at $5/mo. Powersync starts at $0/month and has a free tier.

Signal by signal

Which to pick

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

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