Best API Design Software for Git

Specmatic offers a no-code, specification-driven, and visual approach to API testing by leveraging API specifications to automatically execute positive and negative tests. Specmatic Studio offers broad format and protocol support across REST, SOAP, GraphQL, gRPC, WebSockets, and asynchronous messaging systems (message queues and event-driven APIs). Specmatic Studio utilizes specifications as the single source of truth for contract testing, service virtualization (mocking), workflow testing and resiliency testing. It enables backward compatibility testing which detects breaking changes to APIs at design time and in CI, helping teams prevent consumer-impacting regressions before deployment. Specmatic Genie uses API requirements to assist with API design and enables interactive validation of the API specification prior to generating an MCP server. Specmatic MCP Auto-Test generates test cases for JSON validation and tool calls. Specmatic focuses on functional correctness, contract compliance, resiliency, and compatibility testing. It offers open-source testing tools for OpenAPI, MCP and SOAP. Postman collections can be imported to aid specification creation and test generation.