Retriever is a free native Mac API client. Send HTTP requests, organize them in collections, switch environments, and chain one response into the next with {{@Login.body.token}}, no scripts. OAuth 2.0 with auto-refresh, a fast JSON tree, ⌘K for everything, code generation in 7 languages. Imports Postman, cURL and OpenAPI. Everything is plain JSON on your disk: no account, no cloud. Ships with an MCP server so Claude, Cursor and other agents can use your collections.