Tools
Free, instant, no sign-up. Three checkers share one engine — enter a domain once and each tool shows you the slice you came for — and two data pages keep LLM API prices honest.
Website Health Check
The full report: uptime and response time, TLS certificate, domain registration and DNS records on a single page, with a shareable URL.
Run the health check → 🔒SSL Checker
Certificate issuer, validity, days remaining, chain and hostname checks, and the negotiated TLS protocol.
Check a certificate → 📅Domain Expiry Checker
Registrar, registration and expiry dates with a live countdown, plus nameservers and key DNS records from registry data.
Check an expiry date → 🧮LLM API Cost Calculator
Compare monthly LLM API costs across models from your own request and token volumes.
Estimate a bill → 🏆LLM Pricing Leaderboard
A sortable table of every tracked model price, with sources and verification dates.
See the leaderboard →How the checkers work
Each checker takes a bare domain name — nothing else. There are no URLs, paths or ports to supply, and the service only ever connects to the standard web ports of the domain you name. It then works through its checks independently: an HTTP probe for reachability and response time, a TLS handshake for the certificate, a registry (RDAP) lookup for the domain's registration record, and DNS queries for the records that route traffic and mail. Because the sections are independent, one failing part never hides the rest — a site with a broken web server still shows its certificate and expiry dates, which is usually exactly what you need to fix it.
Results are cached briefly, so a report you share with a colleague shows the same snapshot you saw, labelled with the time it was taken. When a certificate or domain is inside ninety days of expiry, the report says so loudly and offers free continuous monitoring through myeventwatch, because a countdown you have to remember to re-check is only half a solution.