Check any website in seconds
Free checks that Vigil runs for its customers every minute, open to anyone. Paste a URL, get a shareable result with a fix for every finding.
Website security check
Grade a site A+ to F on HSTS, CSP, clickjacking, cookie flags, TLS versions and leaked server versions, with a fix for each finding.
SSL certificate check
Expiry date, days left, issuer, SANs, negotiated TLS version, whether the chain, hostname and trust are in order, and how the certificate's lifetime fits the 200, 100 and 47-day rules.
Website down check
Is it down for everyone or just you? One real request from our server in Germany: status code, DNS / connect / TLS / TTFB timing, redirects and response size.
Domain expiry checker
The registry's expiry date, registrar and transfer lock from RDAP (the successor to WHOIS). Also lists name servers and the A, AAAA, MX, NS, TXT and CNAME records.
More free tools
HTTP request tester
A curl-like GET or HEAD from our server: status, DNS / connect / TLS / TTFB timing, redirect chain, response headers, TLS details and the first 2 KB of the body.
DNS & email auth check
A, AAAA, MX, NS, TXT and CAA records, plus SPF syntax and the 10-lookup limit, DMARC policy and reports, and DKIM on common selectors.
Cron expression generator & explainer
Build a cron expression from plain choices, or paste one for its plain-English meaning, the next 10 runs in any timezone and the traps it falls into.
Cron converter: systemd, Quartz, AWS
One schedule as a crontab line, a systemd OnCalendar= timer, a Quartz or AWS EventBridge cron(), with GitHub Actions and Kubernetes notes.
Uptime & downtime calculator
What 99.9%, 99.99% or any SLA allows per day, week, month, quarter and year, the nines, and composite SLAs (series or parallel).
Outage notice generator
Status page updates, customer emails, short posts and WhatsApp/SMS messages for every incident stage, from investigating to maintenance complete.
Reference: cron schedule examples (every 5 minutes, hourly, daily, weekdays, monthly ...) · uptime SLAs: 99.9% · 99.95% · 99.99% · 99.999%