We built the monitor we wished
actually existed.
One that sees your website the way your visitors do, not just the way your server does.
Reachable is not the same thing
as a working page.
Traditional uptime monitors answer one question: "Does the server respond?". That does not mean your visitors see a working page. A CSS deployment can break your layout. A CDN glitch can serve stale assets. A plugin update can wipe out your checkout flow. The server keeps responding, the monitor stays green, and customers leave.
We saw it firsthand: uptime was 100%, but the site was visually broken for hours before anyone noticed. Existing tools couldn't catch it because they never actually looked at the page. They checked the heartbeat but not the patient.
Visual Sentinel was built to close that gap. We don't just ping your server: we render your pages in a real browser, take screenshots, compare them pixel by pixel, and alert you the moment something looks wrong. Combined with performance, SSL, DNS, and content checks, you get a complete picture of your site's health.
Built by Acefina LLC
Operator of Visual Sentinel
Acefina LLC builds and operates Visual Sentinel from the same production monitoring problems the product is designed to catch. The platform uses a real Playwright + Chromium browser so it can see broken pages, layout failures, and client-side issues that cheap HEAD requests miss.
The product grew out of a recurring frustration on the ops side: client sites that passed every UptimeRobot check while real visitors reported a blank white screen after a CSS deploy, a broken checkout after a WordPress plugin update, or an expired SSL cert that the uptime dashboard still showed 100% green on. The website issue checker (uptime, visual, SSL, DNS, performance, content) exists because those are the failure modes the team kept running into while operating real websites.
Most tools check one or two things.
We check what breaks.
A site can fail in ways a simple ping will never catch. These checks came directly out of incidents we couldn't catch with anything else.
Uptime
HTTP, HTTPS, and TCP checks every 1-5 minutes. Know the moment your site goes down.
Performance
Core Web Vitals, TTFB, and full page load times. Catch slowdowns before they cost conversions.
SSL & TLS
Certificate expiry warnings, chain validation, and protocol checks. Never get caught by an expired cert.
DNS
Record change detection and propagation monitoring. Spot hijacking or misconfiguration instantly.
Visual
Pixel-level screenshot comparison. See exactly what changed on your page, even when the server says everything is fine.
Content
Text and markup change tracking. Detect defacements, accidental edits, or third-party script changes.