# Contract Testing

Explore 3 online contract testing tools in your browser. Text inputs are not stored, and uploaded files are automatically deleted after 6 hours.

> Canonical page: https://elysiatools.com/en/tags/contract-testing

## Overview

Browse 3 contract testing tools for working with contract testing workflows through the Elysia Tools browser interface, with processing handled on Elysia Tools servers.

## Frequently asked questions

### What are Contract Testing tools used for?

Contract Testing tools support workflows related to contract testing. Browse the available tools to find the operation that matches your task.

### How many Contract Testing tools are available?

This tag currently includes 3 Contract Testing tools.

### How is my data handled?

You operate the tools in your browser, while processing runs on Elysia Tools servers. Text inputs are not stored, and uploaded files are automatically deleted after 6 hours.

## Tools

- [API Breaking Changes Detector & Migration Planner](https://elysiatools.com/en/tools/api-breaking-changes-detector-migration-planner): Compare two OpenAPI 3.x schemas, identify breaking changes, grade client impact, and suggest migration or compatibility strategies
- [API Contract Mutation Tester](https://elysiatools.com/en/tools/api-contract-mutation-tester): Mutate OpenAPI request fields into semantically risky variants and optionally send them to a real backend to check defensive validation coverage
- [API Contract Stress Tester](https://elysiatools.com/en/tools/api-contract-stress-tester): Generate boundary-value test cases from an OpenAPI 3.x document and optionally send them to a real backend to spot contract mismatches

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