
Open source API development ecosystem
Hoppscotch is a free, open-source API development ecosystem trusted by millions of developers to build, test, document, and collaborate on APIs. It supports REST, GraphQL, WebSocket, MQTT, SSE, and Socket.IO protocols, and is available as a web app, desktop app, or CLI.
Send HTTP requests, inspect responses, and write assertions to validate API behavior
Dedicated GraphQL client with schema exploration, auto-completion, and query building
Test WebSocket, MQTT, SSE, and Socket.IO connections directly from the interface
Manage environment variables and use them across requests for different deployment stages
Create workspaces for teams, organize requests in collections, and share them with collaborators in real-time
Deploy Hoppscotch on your own servers for full data privacy, security, and compliance
Platform-agnostic availability via web browser, native desktop application, or command-line interface
Quickly test and debug REST and GraphQL APIs during development without leaving your browser
Share API collections and workspaces with your development team for consistent testing practices
Deploy on your own infrastructure for organizations with strict data privacy and compliance requirements
Test WebSocket, MQTT, and SSE connections for real-time applications and IoT projects
Best overall open-source API testing tool for teams. Zero-friction browser access, self-hosting capability, and broad protocol support make it the most versatile Postman replacement.
Best for mixed-skill teams that need instant, web-based collaboration on API collections without requiring everyone to learn Git workflows.
Organize API requests into collections and folders for structured project management
Available in 30+ languages so developers worldwide can use it in their native language
A lightweight, open-source replacement for Postman that avoids vendor lock-in and heavy resource usage

The fastest AI code editor — built in Rust for speed and collaboration