Open Source Alternatives to Postman
What is Postman?
Postman is a collaboration platform for API development that allows developers to design, test, and document APIs.. There are currently 27 open-source alternatives to Postman, with a combined total of 315.5k GitHub stars. The most common language among these projects is TypeScript.
Showing 27 open-source alternatives
An open-source API development ecosystem for testing HTTP, WebSocket, GraphQL, and other APIs with real-time collaboration.
An open-source, offline-first API client that stores collections as files for Git-based collaboration.
An open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE, and gRPC with local, Git, and cloud storage options.
An open-source, cross-platform API client for GraphQL, REST, WebSockets, SSE, gRPC, and other HTTP-compatible protocols.
A fast, privacy-first desktop API client for REST, GraphQL, WebSockets, SSE, and gRPC.
An open-source API platform providing a modern REST API client and beautiful API references with first-class OpenAPI/Swagger support.
An open-source continuous testing platform with AI assistant, integrating test management, API testing, and team collaboration.
A terminal-based HTTP client for keyboard-centric API testing and development workflows.
Interactive terminal UI for inspecting, debugging, and sending HTTP requests with cURL-like syntax.
A local-first API client and HTTP interceptor for building, testing, and mocking APIs directly in your browser or desktop.
A command-line tool that provides an interactive web UI for testing and debugging gRPC servers, similar to Postman for gRPC APIs.
An open-source, cross-platform API development and testing tool with plugin support for REST, Websocket, and more.
A beautiful, feature-rich GraphQL Client IDE for debugging queries across all platforms.
A terminal-based API client for sending HTTP/WebSocket requests, managing collections, and scripting—free, offline, and account-less.
A free, native macOS application for testing and debugging HTTP/REST endpoints with a lightweight UI.
A fully-featured HTTP client interface for Neovim, supporting REST, GraphQL, gRPC, and WebSocket requests.
A fast, asynchronous HTTP client for Neovim that runs HTTP requests directly from .http files within the editor.
An open-source, self-hosted, collaborative API development environment for teams to securely manage and share API collections.
An open-source API Quality Assurance framework for automated testing of REST, GraphQL, gRPC, tRPC, and SOAP APIs.
A free and open-source cross-platform functional testing solution for APIs and web services.
A desktop application for testing, debugging, and interacting with REST APIs and web services.
A fast, extensible JavaFX-based workbench for crafting and testing HTTP, gRPC, GraphQL, and other requests via plugins.
A native API testing tool for developers, supporting both HTTP and gRPC protocols with a focus on simplicity and local data storage.
A terminal HTTP API client that organizes requests in files, supports scripting, and uses curl/wget/httpie as backends.
A hackable HTTP client for F# and .NET that combines convenience with flexibility for both interactive exploration and production use.
A REST API testing tool for iOS that lets developers test APIs on mobile devices without a desktop PC.
An HTTP-based API testing application for GNOME built with GTK4 and Libadwaita.
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