Open Source Alternatives to Postman
An API development platform that enables engineers to design, test, document, monitor, and distribute APIs and services, with AI assistance and collaboration features for individual and team workflows.
Whether you want to cut software costs or escape vendor lock-in, these open source alternatives to Postman give you an option you fully own. Run them on your own server or desktop, so your data stays under your control. This page lists 12 open source alternatives to Postman. The most popular are Hoppscotch, Bruno and Insomnia. Most use the MIT or AGPL-3.0 license, and 6 offer an official Docker image.
Hoppscotch
Test, debug, and document APIs using a lightweight client that supports multiple protocols and team collaboration.
Bruno
An offline API client that stores collections on the local filesystem for version control via Git.
Insomnia
A cross platform API client for debugging, designing, and testing REST, GraphQL, gRPC, and WebSocket protocols.
Yaak
A privacy-first desktop API client supporting REST, GraphQL, gRPC, and WebSockets with local-only data storage and Git integration.
Scalar
Generates interactive API documentation and provides an offline first client for testing OpenAPI and Swagger specifications.
Mockoon
Design and run mock REST APIs locally to reduce dependency on external services during software development.
massCode
A local first developer workspace combining code snippets, markdown notes, and an integrated HTTP client.
Requestly
Build and test REST and GraphQL APIs with local storage and Git synchronization for developer collaboration.
Reqable
Capture and analyze network traffic while testing REST APIs across desktop and mobile platforms.
Altair
A GraphQL client IDE for debugging queries and implementations across multiple desktop and browser platforms.
HTTPie
A command line and desktop client for making HTTP requests and testing REST APIs via terminal.
Voiden
An offline API workspace that uses plain text files to unify requests, documentation, and tests.
Join our newsletter to get shiny new open source software delivered to your inbox. Unsubscribe anytime.