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Convex vs Powersync

Convex scores higher on the AgentReady, 61/100 against 50/100. They differ on 5 of the 41 signals. Which ones decides whether an agent can adopt them without a person watching.

What each one is

Convex. The reactive backend platform that keeps up with you and your agents.

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 Convex is ahead

Convex passes fast time to first request, copyable quickstart and official python sdk, and Powersync does not. That is adopt, whether an agent can get a key and make its first successful call without a human in the loop.

It also holds operate: retry behavior documented and agent compatibility verified. Powersync misses those.

What neither does

Both fail mcp discoverable, structured api reference, openapi / spec quality, authentication documented, request examples provided, response examples provided, errors and status codes documented, limits / constraints documented, programmatic credential creation, mcp integration available, structured, predictable output, machine-readable errors, 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 87/100 here. Convex misses mcp discoverable; Powersync misses mcp discoverable.

Understand. Both sit at 23/100 here. Convex misses structured api reference, openapi / spec quality, authentication documented, 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. Convex leads 76 to 55. Convex misses programmatic credential creation, mcp integration available; Powersync misses programmatic credential creation, fast time to first request, copyable quickstart, official python sdk, mcp integration available.

Operate is whether an agent can run against it in production and recover when a call fails. Convex leads 59 to 35. Convex misses structured, predictable output, machine-readable errors, 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

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

Signal by signal

Which to pick

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

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