Resonance is a local-first, zero-account API client application designed to provide an excellent
user experience for testing and interacting with web services. It offers a modern and intuitive
interface for developers with powerful features for API development and testing.
Key Features:
- Import collections from OpenAPI 3.0 specifications and Postman collections
- Environment management with variable templating for different deployment contexts
- Multiple authentication methods including Bearer tokens, Basic Auth, API keys, OAuth 2.0, and Digest authentication
- Generate code snippets in 9 languages: cURL, Python, JavaScript (Fetch), JavaScript (Axios), Node.js, Go, PHP, Ruby, and Java
- GraphQL support with dedicated query editor and syntax highlighting
- gRPC support for exploring and testing gRPC services
- Collection runner for batch request execution with variable chaining between requests
- Built-in mock server for testing without a backend, with custom responses and configurable delays
- Workspace tabs for managing multiple concurrent requests with independent state
- Request history with search and replay capability for easy debugging
- Performance metrics showing detailed timing breakdown including DNS, TCP, TLS, and download times
- Cookie management with full attribute display
- HTTP proxy support with authentication and bypass lists
- Protocol version control supporting HTTP/1.1, HTTP/2, and HTTP/3
- Comprehensive keyboard shortcuts for efficient workflow
- Four theme options: light, dark, system-adaptive, and black (OLED)
- Available in English, German, Spanish, French, and Italian
