Website Uptime & Status Tools

Tells you why your site is slow in plain English — then backs it with DNS, TCP, TLS, redirect-chain, and time-to-first-byte timing. Server-side, not a full browser render.

Grades how your site serves AI agents and crawlers — agent-facing response headers, text-to-markup ratio, TTFB, title and description lengths, heading structure. Runs on agentspeed.io, built by the same team as WebsiteDown.

Convert uptime percentages to real downtime. See exactly how much downtime 99.9%, 99.99%, or any SLA actually allows per month.

Embed a live “Is it down?” SVG badge for any major service in your README, docs, or site. Updated every 60 seconds, no JavaScript — copy a Markdown, HTML, or URL snippet.

Send a live HTTP request to any URL and see the exact status code returned — 200, 301, 404, 5xx and Cloudflare-specific codes.

Paste up to 20 domains and check them all at once. Live up/down status for every URL in one pass — no refresh required.

Trace every 301, 302, 307, 308 hop a URL takes to its final destination. Time per hop and HTTPS downgrade detection included.

Inspect the HTTP response headers any site returns — security, cache, content, and server identity bucketed for you.

Test any HTTP(S) endpoint with custom method, headers, and JSON body. See status, latency, response sample.

Look up A, AAAA, CNAME, MX, NS, and TXT records for any domain. DNS lookup time included.

Validate any HTTPS site's TLS certificate — issuer, expiry date, SAN list, TLS version, and cipher.

Test whether TCP ports (80, 443, 22, 25, 3306, and more) are open on any public host — common ports at once, or a specific custom port.

Identify which CDN or edge platform a site uses — Cloudflare, Fastly, Vercel, Akamai, CloudFront, and more.

When does a domain expire? Look up registrar, registration date, and expiration via RDAP — no API key needed.