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Sonar

Inspect and debug webhooks

Thiago Fernandes ✓ Verified

io.github.tobagin.sonar
View on Flathub ↗

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

Tunnel running and ready to receive requests
Tunnel running and ready to receive requests
Starting a tunnel to receive webhooks
Starting a tunnel to receive webhooks
Viewing received webhook requests
Viewing received webhook requests
Request history and details
Request history and details
Request statistics and analytics
Request statistics and analytics
Application preferences
Application preferences
Keyboard shortcuts
Keyboard shortcuts
Clear Data dialog
Clear Data dialog
About dialog
About dialog

Observed history

App ChangeVersionWhen ↑
updated2.6.01 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