FREEDOM251

Freedom251 › Compare

Side by side

Schemathesis vs Stubborn Contract

Both stand on contract testing tools. Which one you can start free with, which one lets you read the code, and what each costs once you pay.

Schemathesis

Free plan LinuxMacSelf-hosted+1

Schemathesis provides schema-based API testing with adaptive and stateful workflows, authentication options, and CI/CD integrations. It is free and self-hosted, with custom business-rule checks written in Python.

Visit Schemathesis

Stubborn Contract

Free plan APISelf-hosted

Stubborn Contract combines an open-source contract-testing core with a Broker for cross-branch checks and deployment decisions. It is a practical fit for teams working with supported contract formats and Java-based messaging integrations, though free community support has no public SLA.

Visit Stubborn Contract

The facts

SchemathesisStubborn Contract
Free planYesYes
Open sourceNot publishedNot published
Runs onLinux, Mac, Self-hosted, WindowsAPI, Self-hosted
Lowest paid planFree or on requestFree or on request
Plans published12
MakerNot publishedNot published
Websiteschemathesis.iostubborn.sh
On contract testing tools#14 of 22#18 of 22

Schemathesis: what it does well

  • Generates tests from OpenAPI and GraphQL schemas.
  • Supports stateful, multi-step API workflows.
  • Includes a GitHub Action, Docker image, and pytest integration.
  • Exports JUnit, VCR, HAR, NDJSON, JSON, and Allure reports.
  • Supports Bearer, Basic, and API key authentication.

What to know first

  • Self-hosted deployment model.
  • Custom business-rule checks use Python.
  • Privacy policy says absolute data security cannot be guaranteed.

Stubborn Contract: what it does well

  • Apache 2.0 core and Broker OSS are free to use.
  • Supports HTTP and message-based contracts.
  • Existing Groovy DSL, YAML, and Java DSL contracts continue to work.
  • Broker verifies contracts across branches and services.
  • Supports Kafka, RabbitMQ, and JMS messaging building blocks.

What to know first

  • Community support is best effort, with no public free-support SLA.
  • Java 17 or later is required.

Alternatives to Schemathesis Alternatives to Stubborn Contract The whole list