Website monitoring made simple

Why Speed matters

In a world where attention spans are measured in milliseconds, your website's speed is the first handshake with your customer. Sentinel helps you prevent conversion loss by providing continuous monitoring and historical trends.

Every 100ms delay in load time can hurt conversion rates by up to 7%. Google's Core Web Vitals are now a primary ranking signal, meaning slow sites are pushed further down search results.

Core Web Vitals & Metrics

• LCP (Largest Contentful Paint): Measures loading performance. Target: Under 2.5s.
• CLS (Cumulative Layout Shift): Measures visual stability. Target: Under 0.1.
• TBT (Total Blocking Time): Measures interactivity. Target: Under 200ms.
• TTFB (Time to First Byte): Measures server responsiveness. Target: Under 0.8s.

Continuous Uptime

Our global monitoring network checks your site every 60 seconds from multiple geographic locations. This ensures that even localized outages are detected and reported immediately.

We use "Double-check" logic to verify downtime from a secondary node before alerting you, virtually eliminating false positives caused by temporary network routing issues.

Proactive Protection

• SSL Certificate Monitoring: We track expiry dates and chain validity, alerting you 30, 15, and 7 days before expiration.
• DNS Record Tracking: Detect unauthorized changes to A, AAAA, MX, or CNAME records that could indicate a domain hijacking attempt.
• Security Header Audit: We analyze HSTS, CSP, and X-Frame-Options to ensure your site is following best practices for web security.

Developer First

Connect your existing workflow with our comprehensive RESTful API. Built for modern DevOps teams, our API allows you to automate everything from domain setup to report generation.

Integrate Sentinel directly into your CI/CD pipeline to trigger performance checks before and after deployments, ensuring every update maintains your speed standards.

Powerful Features

• Full API Access: CRUD operations for all monitoring configs, historical data retrieval, and real-time status checks.
• Custom Webhooks: Receive real-time JSON payloads whenever an alert is triggered, resolved, or a scheduled check is completed.
• Data Export: Export your monitoring history in CSV or JSON formats for custom analysis or stakeholder reporting.

Intelligent Analysis

Raw data is useless without a plan. Our integrated AI engine (powered by Gemini/OpenWebUI) analyzes every monitoring report to find patterns that humans might miss.

It correlates different data points—like a drop in PageSpeed matching a recent DNS change—to give you a holistic understanding of your site's health and potential issues.

Actionable Insights

• Natural Language Summaries: Get human-readable digests that explain exactly why your score changed and what it means for your business.
• Prioritized Action Items: Instead of a long list of bugs, get a "Top 3" list of changes that will yield the biggest improvement in user experience.
• Anomaly Detection: Our AI learns your site's "normal" behavior and alerts you to subtle performance drifts before they become critical failures.

Multi-Channel Delivery

Stay informed wherever your team works. We support instant delivery via Email, Slack, Discord, and custom Webhooks. Configure specific channels for different types of alerts.

Our notification system is built on Laravel's robust queue system, ensuring that critical alerts are dispatched in milliseconds without delay.

Smart Management

• Throttling & Cooldown: Prevent notification fatigue with smart cooldown periods. We won't flood your inbox if a service is flapping.
• Custom Thresholds: Set specific triggers for alerts—like receiving a notification only if PageSpeed falls below 80 or Response Time exceeds 1000ms.
• Escalation Policy: Ensure the right people are notified at the right time. Send initial alerts to developers and escalate to management if issues persist.

Long-term Retention

Data is only valuable when you can see the big picture. Sentinel stores your high-resolution monitoring history for up to 12 months, allowing for deep year-over-year comparisons.

Analyze how your site's performance has improved after major updates or track how seasonal traffic spikes affect your response times and uptime.

Visual Analytics

• Interactive Charts: Powered by AgCharts, our dashboards provide fluid, interactive visualizations of your uptime, response times, and Core Web Vitals.
• Trend Aggregation: View data aggregated by hour, day, or month to filter out temporary noise and focus on long-term stability and growth.
• Comprehensive Logs: Every single check is logged with its raw response data, providing a complete audit trail for troubleshooting past incidents.