Uptime Monitoring
Uptime monitoring that catches what 200 OK hides
Uptime monitoring is essential. If your server is down, you need to know immediately. But a 200 OK response does not mean your site works. Broken JavaScript bundles, missing stylesheets, and redirect loops all happen while your uptime tool reports everything is fine. Sitewatch checks uptime and then goes further -- verifying that what your visitors actually see is a working page.
- HTTP status checks plus full asset and resource verification
- Detect "up but broken" failures invisible to ping-based tools
- Alerts across 6 channels with evidence, not just up/down status
Site up but broken
Uptime ping: passing
Page health
Recent activity
- HTTP 200 OK -- server responding6:00 AM
- main.7f3e1.js -- 404 Not Found6:00 AM
- app.css -- MIME type text/html6:00 AM
- /dashboard -- redirect loop (3 hops)6:00 AM
Beyond uptime
Uptime monitoring is table stakes. Here is what you are missing.
Broken JavaScript detection
Your JS bundle returns a 404 after a deploy. The page loads but forms, navigation, and checkout silently stop working. Uptime tools see nothing wrong.
Missing stylesheet alerts
A CSS file served with the wrong MIME type leaves your site looking like raw HTML. The server still says 200 OK. Your visitors say goodbye.
Redirect loop detection
A misconfigured redirect sends visitors in circles. The server responds to every request, so uptime tools report all clear while real users see an error page.
CDN and edge failures
Your CDN returns an error page instead of your assets but with a 200 status code. Sitewatch validates MIME types so these silent failures get caught.
Third-party script outages
Payment processors, analytics, and chat widgets can go down independently. Your site is up but critical features vanish. Sitewatch checks every referenced script.
Performance degradation
Your server responds in 50ms but the page takes 12 seconds to become usable. Uptime tools call it fast. Your bounce rate tells a different story.
Every page
Assets verified per check
2-of-3
Retry confirmation before alerting
<2 min
From failure to alert
Ping monitoring included
Yes, we do the uptime part too
5-minute ping checks
HTTP probe every 5 minutes on all plans. SITE_DOWN and UNAVAILABLE detection built in. Your sites are checked around the clock without gaps.
Uptime percentage tracking
Track availability over 1, 7, 30, or 90-day windows depending on your plan. Know your exact uptime -- not an estimate.
Uptime history visualization
Visual uptime bar on your public status page. Clients see long-term reliability at a glance. No manual reporting needed.
Complementary monitoring
We check if your site is up AND if it is working correctly. Ping monitoring catches downtime. Website monitoring catches everything else. One tool, full coverage.
The blind spots
Failures that happen while your uptime tool says OK
Asset and resource failures
- JavaScript bundles returning 404 after deployments
- CSS files served with incorrect MIME types
- Missing images, fonts, and media resources
- Third-party scripts failing or timing out
- CDN edge nodes returning error pages as 200
Navigation and routing failures
- Redirect loops and redirect chains over 3 hops
- Pages returning soft 404s (200 status with error content)
- Mixed content warnings blocking secure resources
Functional breakage
- Forms that load but fail to submit
- Checkout flows broken by missing dependencies
- API endpoints returning errors behind a healthy homepage
How it works
How Sitewatch goes beyond uptime
Check availability
Sitewatch sends an HTTP request to your page and verifies the server responds with the expected status code. This is where uptime tools stop. We keep going.
Parse and discover assets
The page HTML is parsed to extract every referenced script, stylesheet, image, and font. Each asset becomes a verification target.
Verify every resource
Each discovered asset gets checked for HTTP status and MIME type. A JavaScript file returning text/html is flagged -- browsers will refuse to execute it even though the status is 200.
Alert with full evidence
Confirmed failures trigger alerts across 6 channels -- Slack, email, SMS, webhook, PagerDuty, and Opsgenie -- with the exact asset URL, status code, expected vs actual MIME type, and which page is affected. No guesswork needed.
Your uptime tool says everything is fine. Is it?
Find out what your visitors actually see. Free plan, no credit card required.
The difference
Uptime monitoring vs. website monitoring
| Feature | Traditional uptime monitoring | Sitewatch |
|---|---|---|
| What gets checked | Server responds with 200 | Server, assets, scripts, styles, and images |
| Broken JS bundles | Invisible -- server returns 200 | Every script checked for status + MIME type |
| Missing CSS | Not checked | Detected with asset URL and failure reason |
| Redirect loops | Follows redirects silently | Redirect chains flagged and reported |
| CDN failures | Looks fine from ping | MIME type validation catches silent CDN errors |
| Third-party outages | Not monitored | Every referenced script verified |
| Alert detail | Up or down | Exact asset URL, status code, failure type |
| False positive prevention | Single check | 2-of-3 retry confirmation |
What gets checked
Broken JS bundles
Missing CSS
Redirect loops
CDN failures
Third-party outages
Alert detail
False positive prevention
FAQ
Uptime monitoring questions answered
Traditional uptime monitoring sends a ping or HTTP request and checks whether the server responds. Sitewatch does that too, but then goes further by parsing the page HTML and verifying every referenced JavaScript bundle, stylesheet, and image. This catches "up but broken" failures where the server responds fine but the page is actually unusable.
Yes. Sitewatch runs 5-minute ping checks on all plans with built-in SITE_DOWN and UNAVAILABLE detection. You get uptime percentage tracking across configurable time windows, a visual uptime history bar on your status page, and then everything uptime tools cannot do: asset verification, MIME type validation, and redirect chain detection. One tool replaces your uptime monitor and covers the blind spots it was missing.
Every 5 minutes on all plans. Ping checks run independently from full website checks and detect both SITE_DOWN (complete failure) and UNAVAILABLE (5xx errors, timeouts). Uptime percentage is tracked over configurable windows and displayed on your public status page.
It means your server returns a 200 OK status code but the page does not actually work for visitors. Common causes include broken JavaScript bundles after deployments, CSS files served with wrong MIME types, missing images, and redirect loops. Traditional uptime monitoring only checks the HTTP response code, so these failures go undetected.
Detected issues go through 2-of-3 retry confirmation to prevent false positives from transient glitches. Once confirmed, alerts are sent via Slack, email, SMS, webhook, PagerDuty, or Opsgenie within minutes. Each alert includes the exact asset URL, HTTP status code, and failure type so you can diagnose immediately.
Yes. Sitewatch supports monitoring multiple sites from a single dashboard. Each site gets independent uptime checks plus full asset verification. This is especially useful for agencies managing client websites or teams running multiple properties.
Explore more