Postman

Postman is a platform for working with APIs across their whole lifecycle, used by a very large community of developers. It started as a tool for sending HTTP requests and inspecting responses, and grew into a workspace where teams organize requests into collections, chain them with scripts and variables, write automated tests, mock endpoints, and run collections in continuous integration through its command-line runner. Postman also covers API design with support for specifications like OpenAPI, auto-generated and hosted documentation, a private and public API network for discovering and sharing APIs, monitoring for uptime and correctness, and governance rules for keeping APIs consistent across an organization. Shared workspaces, role-based access, and version control support team collaboration, and Postman has added AI features, including an assistant that helps build and debug requests and tooling aimed at designing and testing APIs and agents that call them. It runs as a desktop app backed by the cloud, with a lightweight web version. Postman offers a free tier for individuals and small teams with limits on collection runs, mock calls, and history, and paid plans that raise those limits and add enterprise administration, security, and reporting.