SiteSentry: Because 'A Client Told Me My Site Was Down' Should Never Happen Again
There is a specific flavor of dread reserved for the moment a client texts "hey is the site down for you too?" and you find out from them, not from a monitoring tool. SiteSentry exists to make sure that text message never happens again.
Nine checks, every run: SSL expiry, uptime and response time, security headers (HSTS, X-Frame-Options, X-Content-Type-Options, Referrer-Policy and more), plus SEO and broken-link checks — daily, automatically, across every site you manage, free for your first site. The description is refreshingly blunt about where these checks came from: "the same checks we use to keep our own network of production sites healthy." That's not a marketing line — this entire network of a dozen live products is, in fact, the dogfood.
The unglamorous stuff that actually matters
Nobody gets excited about certificate expiry dates until the morning a visitor hits a browser warning screen instead of the homepage. SiteSentry's whole value proposition is catching the boring failure modes — expired SSL, missing security headers, a 404 that used to be a working page — before a client, a customer, or Google notices first. It's the site-health equivalent of a smoke detector: forgettable right up until the one time it isn't.
If your interest in "things staying healthy" extends to your actual server room and not just your website, that's a job for a very different kind of monitoring — the fictional kind, over in the Rack Simulator. And if the site you're worried about belongs to a coating contractor instead of a web shop, CoatQuote solves a completely different Monday-morning problem.
