Best Open Source Postman Alternatives

Lightweight, fast, and feature-rich API client for developers. Test, debug, and document APIs with ease in a clean, modern interface.

A modern, user-friendly API client that simplifies API testing and development with a clean interface and powerful features.

Intuitive API client for REST, GraphQL, and gRPC. Debug, test, and collaborate on APIs with ease across platforms.

A modern API client offering local-only data storage, Git integration, plugin extensibility, and multi-protocol support for developers.

Scalar is an open-source tool for building, customizing, and hosting interactive API documentation with OpenAPI support.

Create, run, and share mock REST APIs without coding. Boost productivity with an intuitive interface and powerful features.

A powerful browser extension and desktop app for developers to manipulate network requests, debug APIs, and improve web app testing

Intuitive, user-friendly CLI tool for making HTTP requests, debugging APIs, and testing web services with ease and efficiency.

All-in-one platform for API testing, documentation, and collaboration, simplifying the entire API development lifecycle.

Offline-first API workspace that unifies specs, docs, tests, and mocks in programmable Markdown blocks. Version control everything in plain text files.

Full-lifecycle API management platform that unifies synchronous and asynchronous ecosystems. Manage APIs, event streams, and AI agents with enterprise security and 4x faster gateway performance.