Screenshots & videos
About
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, Digest and AWS Signature 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 - WebSocket support with persistent connections and handshake headers - Server-Sent Events (SSE) support with automatic reconnection - MQTT support with topic subscribe/publish, QoS levels, and TLS brokers - 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, Italian and Portuguese (BR)
Changelog
Feature stabilization release - Fix edits landing in the wrong request, schema, or script on fast endpoint and tab switches - Resolve variables in Basic, Digest, NTLM, and AWS credentials, and support non-Latin Basic auth passwords - Keep secret variables in the keychain when a script updates them - Make Enter on the focused Cancel button cancel instead of confirm - Send duplicate query keys and survive literal percent signs in the URL - Honor cleared overrides in the collection runner and resolve dynamic variables freshly per request - Fix cURL --data-urlencode import, snippets for non-JSON bodies, and drag-and-drop reordering - Fix hang on recursive OpenAPI schemas - Speed up collection loading, the runner, streaming, and large response previews
Additional information
- Developer
- Dennis Blümer
- License
- MIT
- Category
- Developer Tools
- Languages
- en_US
- Size
- 12.4 MB
- Homepage
- https://github.com/db-mobile/resonance
- Available via
- Flathub (Flatpak), Flathub (Flatpak), Snap Store (stable build), AUR, AUR (bin build), AUR (git build), Nixpkgs, GOG
- Catalog data as of
- 9/3/2026 (dataset snapshot date — per-app update dates aren't tracked yet)