The free website health check makes one HTTPS request to a public address and reports what it finds. No signup, and we don't store the results.
What it checks
- Reachability: does the site answer over HTTPS without an error?
- Server response time: time to first byte (good ≤ 800 ms; slow > 1,800 ms). It's one sample from our region.
- HTTPS certificate expiry: warns under 30 days, fails under 14.
- Redirect chain: more than two hops earns a warning.
- Security headers: HSTS, Content-Security-Policy, X-Content-Type-Options, clickjacking protection and Referrer-Policy.
- Version disclosure: whether headers reveal exact software versions.
What it doesn't do
It's a single snapshot, not continuous monitoring, and it doesn't log in, submit forms or test checkout flows. A healthy result means the page answered, not that every workflow works.
Safety limits
The checker only contacts public HTTPS addresses. It refuses private networks, follows at most five redirects, sends no cookies or credentials, stops after 10 seconds, and limits how often any one visitor or website can be checked.