About Powerduck

Powerduck is a local-first OpenAPI studio built for teams shipping APIs in the AI-coding era.

When an agent finishes a task, "done" is a claim. The spec is how you verify it.

Powerduck runs your OpenAPI spec against the live system — not as a collection you maintain by hand, but as the contract itself. If the agent's implementation drifted from what the spec says, you catch it before review.

Mock from the spec. The contract drives the mock server, not sample requests typed into a client.
Verify against the live endpoint. Run the same spec in CI or locally. Drift shows up as a diff, not a surprise in prod.
Expose the spec as an MCP server. Your AI coding agent reads the contract as context instead of guessing from stale docs.
Runs on your machine. The YAML lives in your repo, diffs in git, opens in Powerduck instantly. No cloud account, no workspace lock-in, no telemetry.

Postman-style clients were built for humans poking endpoints by hand. Powerduck is built for verifying that what the agent built actually matches what you agreed on.

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