Sonar is a native tool for debugging webhooks. It captures incoming requests and lets you inspect headers, body content, and query parameters in real-time.
Core Features:
- Instant public URLs via ngrok integration for webhook testing
- Real-time capture of incoming webhook requests as they arrive
- Detailed inspection of headers, body content, query parameters, and metadata
- Quick copy functionality including JSON, cURL, and HTTP formats
- Clean Libadwaita interface that integrates perfectly with GNOME
- Fast and lightweight native application with minimal resource usage
Advanced Features:
- Request bookmarking and starring for quick access
- Request replay to resend webhooks to custom URLs
- Side-by-side request comparison to spot differences
- Request templates for saving and reusing webhook patterns
- Automatic webhook forwarding to multiple URLs
- Advanced filtering by method, content-type, time range, and search
- Persistent history with JSON storage
Screenshots
Observed history
| App | Change | Version | When ↓ |
|---|---|---|---|
| updated | 2.6.0 | 1 Oct 2026 |
Upstream releases
Release notes supplied by the developer. These dates are not Flathub package publication times.
2.6.01 Oct 2026
🔧 Dependency & Platform Updates
Changes:
- Updated to the GNOME 51 runtime
- Updated libsecret to 0.21.8
- Refreshed the bundled ngrok binary to 3.39.11
2.5.03 Jun 2026
🔧 Dependency & Platform Updates
Changes:
- Updated to the GNOME 50 runtime
- Refreshed the bundled ngrok binary to the latest stable release
2.4.020 Jan 2026
📱 Mobile Adaptation & UI Refinements
New Features:
- Fully responsive layout optimized for mobile devices
- New dedicated controls for mobile view
Improvements:
- Refined request row layout for better accessibility
- Improved action buttons arrangement
2.3.212 Jan 2026
📝 Documentation & Metadata Updates
Improvements:
- Added branding colors to AppStream metadata
- Simplified application summary and description
- Updated README with Flathub/Ko-fi badges and simplified instructions








