SuperTest vs Schemathesis

Free and open source

Free tier available

Free and open source. You pay in engineering time and CI minutes.

Open source. A commercial hosted service exists for reporting and continuous runs.

Everything, self-hosted

The CLI and Python library are open source and free.

Widely used

OSS community · since 2014

Established

Schemathesis · since 2019

• Fast: no network, no separate server process, no port conflicts in CI.
• Tiny API you can learn in ten minutes.
• Works with whichever runner you already use.

• Enormous coverage for almost no authoring effort — the schema is the test suite.
• Reliably finds unhandled server errors and schema violations that manual tests miss.
• Failures come with a minimal reproducing case.

• Node.js only, and only for services you host yourself.
• In-process testing skips the real network stack, proxies and load balancer.
• No environment management or collection concept for cross-service flows.

• Only as good as your schema; a vague or inaccurate spec produces noise.
• Tests conformance, not business correctness — it cannot know a discount was miscalculated.
• Generated failures can be tedious to triage at first.

Node.js API projects testing their own routes in the unit/integration layer.

Any team with an accurate OpenAPI spec who wants deep coverage cheaply.