Your Site Looks Broken. Your Monitor Says It's Fine.
Visual Sentinel renders your pages in a real browser and compares screenshots pixel-by-pixel. Catch broken layouts, missing images, and visual regressions that return HTTP 200.
What Is Visual Monitoring?
Visual monitoring, also called visual regression detection, is an automated process that takes screenshots of your web pages and compares them pixel-by-pixel against a known-good baseline. When something changes visually, a broken CSS file, a missing image, a layout shift, or a third-party script injecting unwanted content, the system detects the difference and alerts you. This catches issues that traditional uptime monitors miss entirely: a page can return HTTP 200 OK while rendering a blank white screen, showing broken layouts, or displaying the wrong content. Visual Sentinel uses Playwright with a real Chromium browser to render your pages exactly as visitors see them, then compares each screenshot against the baseline with a configurable sensitivity threshold to reduce false positives from dynamic content like ads or timestamps.
What our users say.
“I tried UptimeRobot and ChecklyHQ, but neither solved the problem of finding broken pages until we checked manually. With Visual Sentinel, we get instant alerts and can fix our WordPress sites quickly instead of finding issues by accident.”
Eric D.
Powered Storage
“We run an agency and due to Elementor updates or cache issues, some client websites would break. We only found out from client complaints because UptimeRobot didn't catch visual issues. After switching to Visual Sentinel, we get alerts about broken pages in minutes. Would recommend 5/5.”
Jeff QB
The DWCO
“Managing many projects, I can't always keep an eye on every website. When something broke after an update, we wouldn't know until someone reached out. After using Visual Sentinel, life has become a lot easier knowing we'll be alerted via Slack and any team member can jump on it immediately.”
Shahid K.
CueBytes
Built for the failures
HTTP 200 hides.
Automated Screenshots
We take full-page screenshots of your site on every check using a real browser (Playwright + Chromium). Not just HTTP pings.
Pixel-Level Comparison
Detect even subtle visual changes. Layout shifts, missing assets, font changes, color differences, nothing slips through.
Adjustable Sensitivity
Set your own threshold for what counts as a "change." Ignore dynamic content like ads or timestamps while catching real issues.
Instant Visual Change Alerts
Get notified immediately when a visual regression is detected. See a side-by-side diff of what changed.
Screenshot History
Browse historical screenshots to see how your site has evolved. Pinpoint exactly when a visual issue was introduced.
Part of 6-Layer Monitoring
Visual monitoring runs alongside uptime, performance, SSL, and DNS checks. One tool, complete coverage.
Monitor Website Changes Continuously
Track visual changes, content edits, and price updates on any web page on a schedule you control. Get alerted the moment something moves.
Most monitors only watch for outages. Visual Sentinel watches for changes too. On every check, we render the page in a real Chromium browser, take a full-page screenshot, and compare it pixel-by-pixel against the most recent confirmed baseline. If the difference exceeds your configured threshold, you get an instant alert with a side-by-side comparison and a highlighted diff image.
Pair visual monitoring with content monitoring (which tracks specific text or markup elements via CSS selectors), and you cover both “the page looks different” and “the price changed” cases on the same monitor.
Common change-monitoring use cases
- Catch deploy regressions. When a CSS update shifts the hero, breaks the checkout button, or drops a section, the next check fires an alert with a screenshot diff.
- Watch competitor pricing.Track the price element on a competitor's pricing page; get notified the moment they raise or drop prices.
- Watch product availability.Track the “Add to cart” or “Out of stock” element on a target product page; get alerted when it changes state.
- Government and policy pages. Track legal text, deadlines, or policy updates on .gov pages without checking them manually.
- Content drift detection. If your CMS allows team edits, content monitoring catches accidental edits to legal pages, pricing tables, or product descriptions.
- Third-party widget watching. When a third-party script (analytics, chat widget, ad provider) starts distorting the layout, visual monitoring flags it before your users do.
How the change-detection threshold works
Each monitor has a configurable visual mismatch threshold (default 5%). The diff is calculated across the full rendered page; if more than the threshold percentage of pixels differ between the new screenshot and the baseline, the monitor flags a change. For pages with dynamic content (timestamps, ads, rotating featured items), raise the threshold; for pages where every pixel matters (a tightly designed landing page, a checkout flow), lower it.
For text-specific tracking, content monitoring runs alongside visual monitoring on the same check. Define one or more CSS selectors per monitor; we extract the text content of each on every check and alert if it changes. This is precise: it ignores layout shifts and only fires when the actual text moves.
Check frequency
Visual checks run on the schedule of the parent monitor. The Free and Solo tiers check every 30 minutes; Starter checks every 15 minutes; Business and Agency check every 5 minutes. The Free tier is enough for change-watch use cases that are not time-critical (most competitor and policy watching). Bump up to Business when you need sub-15-minute detection on a layout-critical page.
Permanent free tier, 1 monitor, no card required.
Caught in the Wild
These are real production issues detected by Visual Sentinel. No demos, no staging, actual monitoring in action.
Three steps,
no extensions.
Add Your Page
Enter the URL you want to visually monitor. We capture a baseline screenshot immediately.
Set Sensitivity
Choose how sensitive the comparison should be. Filter out dynamic elements that change normally.
Review Changes
When we detect a visual change, you get an alert with a side-by-side comparison showing exactly what changed.