What makes this different from a simple uptime check?

A simple uptime check only verifies your server responds with HTTP 200. Our health check goes deeper: we verify DNS resolution, SSL validity, all external resources your page loads (CDNs, fonts, scripts), security headers, and performance metrics. Your site could return "200 OK" while being completely broken for users if a critical CDN is down.

What are external resources and why do they matter?

External resources are files your website loads from third-party servers: Google Fonts, jQuery from a CDN, analytics scripts, payment widgets, etc. If any of these fail to load, your website may appear broken, unstyled, or non-functional — even though your own server is perfectly healthy.

What security headers should my site have?

Key security headers include: HSTS (forces HTTPS), Content-Security-Policy (prevents XSS), X-Frame-Options (prevents clickjacking), X-Content-Type-Options (prevents MIME sniffing), and Referrer-Policy. Our tool checks which headers are present and warns about missing ones.

What is TTFB and why does it matter?

TTFB (Time To First Byte) measures how long it takes to receive the first byte of data after requesting your page. It reflects your server response time and is a key performance metric. A high TTFB (over 600ms) can indicate server issues, slow database queries, or geographic latency.

How often should I run a health check?

Run a health check after any deployment, server changes, or when debugging performance issues. For continuous monitoring, our paid plans run comprehensive checks every 1-5 minutes and alert you immediately when any component fails.

All Tools

Website Health Check

Complete diagnostic of your website. Check connectivity, SSL, performance, security headers, and all external resources in one comprehensive scan.

Free diagnostic tool • No signup required • Full report in seconds

What This Tool Analyzes

Full connectivity check (DNS resolution, TCP connection, TLS handshake)

SSL/TLS certificate analysis with expiry date

Performance metrics (TTFB, total load time, content download)

Security headers audit (HSTS, CSP, X-Frame-Options)

External resource verification (scripts, stylesheets, fonts, images)

HTTP protocol and redirect chain analysis

Why Full Diagnostics Matter

Beyond Simple Uptime: Traditional monitoring only checks if your server responds. But modern websites depend on dozens of external services: CDNs, font providers, analytics, payment processors, and more. If any of these fail, your users experience a broken site.

Performance Insights: We measure TTFB (Time To First Byte), content download time, and total page load time. These metrics help identify slow servers, database issues, or network latency before they impact user experience.

Security Audit: Missing security headers leave your site vulnerable to attacks. We check for HSTS, Content-Security-Policy, X-Frame-Options, and other critical headers that protect your users.

Frequently Asked Questions

Related Tools & Features

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Monitor Continuously, Not Just Once

This tool gives you a snapshot. For 24/7 monitoring that catches issues the moment they happen, set up continuous monitoring with instant alerts.

No credit card required · Free plan includes 3 websites