Four read-only checkers that probe a hostname from our infrastructure and give you the raw answer with no marketing in between. Use them to debug a site that's misbehaving for some users, audit your TLS certificate before it expires, or inspect what a CDN is actually sending back.
One measured GET from our edge: DNS, connect, TLS, time to first byte, and document download, graded on a published rubric. Plus a browser-side check of your own connection to us, so you can tell a slow server from a slow connection.
Open a real handshake on port 443 and read the peer certificate. Reports issuer, validity window, hostname coverage (SAN), signature algorithm, and chain depth.
Resolve A / AAAA / CNAME / MX / NS / TXT / SOA records using the system resolver, with a per-record-type timeout. Shows what every public resolver should see, useful when sites work for some users but not others.
Walk every Location header from an HTTP request through up to 10 hops. Surfaces scheme downgrades, cookie-drop loops, and CDN-driven redirect chains that hurt SEO and tank page-speed scores.
A live up/down badge for your README, docs or status page. One image tag, updates itself from the same probes behind every check page, free and account-free.
Run /isdown or /mcstatus inside Discord and get a live probe result in chat — four HTTP methods for sites, the native protocol for Minecraft servers.
Third-party scanner that grades how well your site works for AI agents and crawlers: response headers for agents, text-to-markup ratio, TTFB, title/description lengths, and heading structure. Runs on agentspeed.com.
Capture every response header from an HTTP(S) request and grade the security headers (CSP, HSTS, X-Frame-Options, Permissions-Policy) A through F. Plain English on what's missing and why it matters.