External website monitoring for uptime, performance, SSL, DNS, content, and visual changes. Real-browser screenshot diffs catch broken pages that still return 200 OK. No-code setup, instant alerts, and a free plan.
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Maker
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For 6 years I heard the same story from clients: "My site was broken for hours but my monitoring tool said everything was fine." A plugin update breaks the checkout page, a theme conflict wipes the hero section, a CDE glitch swaps out images — but the server still returns 200 OK, so nobody gets alerted.
That's why I built Visual Sentinel. It doesn't just ping your server — it takes screenshots, compares them pixel-by-pixel, and alerts you the moment something
looks wrong. Uptime is just one of 6 layers we monitor (Performance, SSL, DNS, Visual Changes, and Content Integrity).
No code to install, no agents, no browser extensions. Paste your URL and you're protected in 60 seconds. Alerts go wherever your team already works — Slack, Discord, WhatsApp, Telegram, Email, or webhooks.
I built this for the small business owner who can't afford to lose customers overnight, and the agency owner managing 50+ client sites who needs to know before their clients do.
Would love to hear what you think — and if you've ever been burned by a "200 OK but completely broken" situation, I'd love to hear that story too.
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Maker
Maker update, July 21: I refreshed this page with the current owl logo, real product screenshots, and the product as it works today.
Visual Sentinel now checks six layers: uptime, performance, SSL, DNS, content, and rendered-page visual changes. The permanent Free plan includes 3 HTTP + SSL monitors with 10-minute checks from the US and EU. You can also run the public website, SSL, DNS, and speed checkers without creating an account.
Since this launch, we have shipped an Android companion, client-ready monitoring reports, and a 16-tool MCP server for Claude, Cursor, Cline, and Continue. The core promise has not changed: a 200 response does not prove the page your customer sees is okay.
If you are evaluating it, tell me the exact page or failure you need to catch. I am happy to say plainly whether Visual Sentinel fits it.
Maker update, July 21: I refreshed this page with the current owl logo, real product screenshots, and the product as it works today.
Visual Sentinel now checks six layers: uptime, performance, SSL, DNS, content, and rendered-page visual changes. The permanent Free plan includes 3 HTTP + SSL monitors with 10-minute checks from the US and EU. You can also run the public website, SSL, DNS, and speed checkers without creating an account.
Since this launch, we have shipped an Android companion, client-ready monitoring reports, and a 16-tool MCP server for Claude, Cursor, Cline, and Continue. The core promise has not changed: a 200 response does not prove the page your customer sees is okay.
If you are evaluating it, tell me the exact page or failure you need to catch. I am happy to say plainly whether Visual Sentinel fits it.