Skip to main content
Submit a tool

Schemathesis

Open sourceUpdated recentlyPricing may have changed — not yet verified

Property-based API fuzzing driven straight from OpenAPI schemas.

by Schemathesis · Primary workflow: Automated exploratory API testing from OpenAPI contracts

not
scored

No verified editorial score yet. Scores appear only after documented evaluation.

Visit official site ↗Source repository ↗Add to comparisonSuggest a correction

What it is

Schemathesis reads OpenAPI definitions and generates property-based HTTP calls hunting for crashes, spec violations and 5xx responses. It complements example-based API tests by exploring input spaces humans skip.

Editorial basis: vendor documentation and public information reviewed by our editors; written originally for this catalog. Hands-on testing has not yet been performed. Last editorial update 2026-08-26.

Editorial assessment

Best for
  • Backend teams wanting fuzz coverage cheaply
  • Contract hygiene enforcement in CI
Not ideal for
  • APIs without accurate OpenAPI specs
  • Complex auth choreography without setup work
Strengths
  • High defect-finding yield for spec'd APIs
  • First-class pytest integration
Limitations
  • Garbage-in problem: wrong specs misdirect generation
  • Stateful flows need explicit configuration

Hands-on evidence

Vendor information reviewed; hands-on testing not yet completed.

Vendor information reviewed; hands-on testing not yet completed.

When we test this tool ourselves, this section will document the test date, exact scenario, setup experience, example output, integration result and discovered limitations — with reproducibility notes so you can replicate it.

Read our evidence policy →

Pricing

  • Open source

    FreeUnverified

Pricing reflects publicly listed information at research time and is marked unverified until an editor re-checks the vendor’s pricing page. Always confirm on the official site.

Integrations & compatibility

PythonpytestGitHub ActionsDocker
Deployment
CLI, Self-hosted CI
Platforms
Windows, macOS, Linux
Languages / SDKs
Python
API available
Yes
Learning curve
Low
Documentation quality
GOOD
Team fit
Solo, Small team, Mid-size
Support
See vendor

Vendor response

Vendors can respond to listings and reviews through the vendor portal. Responses are moderated and labeled. No response has been received for this listing yet.