WhisperSentinel
Monitor HTTP endpoints and receive instant desktop notifications when specific conditions are met. Perfect for API monitoring, business alerts, and system health checks.
Production API Health
ActiveLow Stock Alert
PausedPrice Monitor
TriggeredPowerful Monitoring Features
Everything you need to monitor your endpoints and stay informed about critical changes.
Desktop Notifications
Get instant native desktop notifications when your conditions are met. Never miss important alerts.
Continuous Monitoring
Automatically check endpoints at configurable intervals from 10 seconds to hours.
JavaScript Conditions
Define complex alert conditions using JavaScript expressions with full access to JSON response data.
Complete History
Review all triggered alerts with timestamps, response data, and detailed logs for troubleshooting.
Authentication Support
Add custom headers including Authorization tokens to monitor protected endpoints securely.
One-time Alerts
Configure alerts that automatically stop after the first trigger - perfect for deal notifications.
How It Works
Get started with WhisperSentinel in just four simple steps.
Configure the Endpoint
Specify the URL of the endpoint you want to monitor and optionally add custom HTTP headers.
Define the Condition
Write a JavaScript expression that determines when the alert should trigger. Use data to access the JSON response.
Set the Frequency
Configure how often you want the endpoint to be checked (in seconds).
Receive Alerts
The application will continuously monitor the endpoint and notify you when your condition is met.
Perfect For
Monitor anything that returns JSON data
API Monitoring
Monitor your production APIs and get notified when services go down or response times increase.
Business Metrics
Track sales, user signups, or inventory levels and get alerts when important thresholds are reached.
Price Tracking
Monitor product prices and get notified when deals become available or stocks run low.
System Health
Monitor server metrics, error rates, and system performance to catch issues early.
Download WhisperSentinel
Available for macOS, Windows, and Linux. Choose your platform to get started.
macOS (Intel)
For Intel-based Macs
macOS (Apple Silicon)
For M1, M2, M3, and newer
Windows
Windows 10/11 (64-bit)
Linux
AppImage (64-bit)
Current version: 1.0.1
System Requirements
macOS
- • macOS 10.15 or later
- • Intel or Apple Silicon
- • 50MB free disk space
Windows
- • Windows 10/11 (64-bit)
- • 50MB free disk space
- • Internet connection
Linux
- • Ubuntu 18.04+ / equivalent
- • X11 or Wayland
- • 50MB free disk space
Frequently Asked Questions
What types of endpoints can I monitor?
Any HTTP endpoint that returns JSON data. This includes REST APIs, webhook URLs, status pages, and any custom endpoints you create.
How secure is my data?
All data stays on your local machine. We don't collect, store, or transmit any of your monitoring data or configurations to external servers.
Can I monitor multiple endpoints?
Yes, you can create unlimited alerts to monitor as many endpoints as you need, each with their own custom conditions and intervals.
Does it work with authenticated APIs?
Yes, you can add custom headers including Authorization tokens, API keys, and any other authentication headers required by your endpoints.