Free tool
How Healthy Is Your Website?
A website health check goes beyond "is it up?" to answer "do your assets load, scripts execute, and pages render correctly?" Your server might respond fine while JavaScript bundles are broken, stylesheets are missing, third-party scripts have failed, or your CDN is serving stale files. Run a free check below — then learn what continuous monitoring catches that one-time checks can't.
- Check availability, assets, and response health
- See what uptime tools miss on your site
- Free, instant, no signup required
Free website health check
Run a health check on any URL
11
Detection rules
Free
No signup needed
Instant
Health report
Health dimensions
What a real website health check covers
Availability & response
Is the server responding? What's the status code? How fast is the response? This is what traditional uptime tools check — but it's only one dimension of health.
JavaScript integrity
Are all JS bundles loading correctly? A broken bundle means your app doesn't work, even though the server says 200 OK. This is the #1 cause of "up but broken" failures.
Stylesheet validation
Are CSS files loading with correct MIME types? A stylesheet served as text/plain gets silently blocked by browsers. Your page loads — completely unstyled.
Third-party scripts
Are your analytics, payment, auth, and chat widget scripts loading? When a third-party CDN fails, your page works but key functionality is silently missing.
Content integrity
Has the page structure changed unexpectedly? SHA-256 fingerprinting detects unauthorized changes, deploy artifacts, or CMS edits that shift page content.
Redirect health
Are there redirect loops or unexpected redirect chains? A misconfigured redirect can make specific pages inaccessible while the homepage works fine.
Health check vs uptime check
A health check is not an uptime check
| Feature | Uptime check | Website health check |
|---|---|---|
| What it checks | HTTP status code | Full page + every linked asset |
| Broken JS detection | No | Yes |
| CSS/MIME validation | No | Yes |
| Third-party scripts | No | Yes |
| Content changes | No | SHA-256 fingerprint |
| Redirect chain analysis | No | Yes |
| Result | "Up" or "Down" | Multi-dimension health report |
What it checks
Broken JS detection
CSS/MIME validation
Third-party scripts
Content changes
Redirect chain analysis
Result
Beyond one-time checks
Why one-time checks aren't enough
Health changes constantly
Your site is healthy right now. After the next deploy, plugin update, or CDN cache expiry — it might not be. One-time checks only tell you about this moment.
Continuous monitoring catches drift
Sitewatch runs health checks on a schedule (every 5-30 minutes) and after every deploy. Catch the broken bundle at 2 AM, not when a customer emails at 9 AM.
Alerts with root cause
When a health check fails, you get the specific cause — not just "site down." Which asset broke, what the error was, and stack-specific steps to fix it.
Website health check FAQ
An uptime check asks "is the server responding?" A health check asks "is the website actually working?" Health checks validate every asset on the page — JS, CSS, images, third-party scripts — not just the server's HTTP status code.
Yes. The health check on this page is completely free with no signup. For continuous automated health checks with alerting, Sitewatch offers a free plan for 1 site.
Manually: after every deploy, plugin update, or configuration change. Automatically: at least daily (free plan) or every 5-30 minutes (paid plans). The most critical time is immediately after deploying changes.
This tool checks availability and basic response health from one location at one point in time. For complete health monitoring — multi-region checks, asset validation, content fingerprinting, and continuous monitoring — sign up for Sitewatch.
The "Is My Website Down" tool answers an urgent question: is it down right now? This health check is proactive — it frames your site's health across multiple dimensions. Same underlying technology, different context and intent.
Related tools & resources
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Is My Website Down?
Quick check if your site is up or down right now.
Free Website Monitoring
Continuous monitoring for 1 site, free forever.
Website Monitoring
How Sitewatch validates every asset on your pages.
Broken Assets Monitoring
Detect broken JS, CSS, images, and fonts.
Deploy Hooks
Trigger health checks from your CI/CD pipeline.
Don't just check health once. Monitor it continuously.
Free plan available. Automated health checks with alerting.