Resonance is a clean and minimal API client application designed to provide an excellent user experience for testing and interacting with APIs.
Built with Electron, it offers a modern and intuitive interface for developers.
This is free and open source software.
Features:
- OpenAPI/Swagger collection imports – Import OpenAPI 3.0 specifications in YAML or JSON format.
- Variable templating system – Use template variables with {{ variableName }} syntax for API keys, base URLs, and more.
- Multiple HTTP methods – Support for GET, POST, PUT, DELETE, and PATCH requests.
- Request body schema generation – Automatically generate example request bodies from OpenAPI schemas.
- Clean, organized interface – Split layout with collections sidebar and tabbed request/response sections.
- Theme support – Light, dark, system, and blueprint themes with CSS custom properties.
- Multi-language support – Available in English, German, Spanish, French, and Italian.
- Secure architecture – Built with context isolation and secure IPC communication.
Website: github.com/db-mobile/resonance
Support:
Developer: Dennis Blümer
License: MIT License

Resonance is written in JavaScript. Learn JavaScript with our recommended free books and free tutorials.
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