Postman

API platform that unifies design, testing, documentation, and mocking across the full API lifecycle. Brings request building, automated tests, mock servers, and collaborative workspaces into a single environment, with support for REST, GraphQL, gRPC, and WebSocket.

Used by tens of millions of developers and hundreds of thousands of companies, including PayPal, Intuit, Cisco, Siemens, and Autodesk. Postman differentiates from point tools like Insomnia or cURL by covering the entire lifecycle, from design through monitoring, with Git and API gateway integrations, an API Network for sharing collections, and Newman for running collections in CI/CD.

Key capabilities:

• API client for manual exploration plus automated test scripting with pre-request and post-response logic
• Mock servers and documentation generation from OpenAPI or Postman Collections
• Shared workspaces, team sync, and version control over API definitions
• Newman, the CLI runner for executing collections in pipelines and local environments
• API Network for discovering and reusing public collections and templates

Teams rely on it for exploratory API testing, contract validation, partner and external developer onboarding, and CI/CD integration. Developers use it to debug endpoints, validate responses, and generate client code, while QA and platform teams automate regression tests via collections and Newman.