Chapar

A fast, secure, and offline API client for developers who test REST and gRPC services. Chapar is a native desktop app written in Go, and it works without an internet connection or an account.

• Cross-platform compatibility: Available for macOS, Windows, and Linux
• Multiple protocols: Handles REST and gRPC services, plus GraphQL queries
• Offline functionality: Test and develop APIs without an internet connection
• Local and private: Requests, environments, and cookies are plain files on your machine, and secret values are encrypted with a key kept in the OS keychain
• Native performance: The UI is GPU-rendered with no browser engine, so the app starts quickly and stays light
• Clean interface: Light and dark themes, including Tokyo Night, Dracula, and Nord

Chapar suits developers and QA teams who want a lightweight desktop client for debugging endpoints, validating responses, and exploring new APIs. Its test cases can also run in CI through a separate command-line runner.