One platform, every signal that matters
From uptime to SEO hygiene, JustChecker checks it all - automatically, on a schedule you control.
Uptime Monitoring
Checks every 5-30 minutes depending on your plan. A debounced state machine requires 3 consecutive failures before alerting you it's down, and 2 consecutive successes before confirming recovery - so a single network blip never triggers a false alarm.
SSL Certificate Monitoring
Native OpenSSL checks read your certificate directly - issuer, validity dates, and days remaining - so you find out about an expiring or misconfigured certificate before your visitors see a browser warning.
Domain Expiry Monitoring
RDAP lookups (with a WHOIS fallback) track your domain's registration and expiry date, with configurable warning/critical/urgent thresholds so a renewal is never a surprise.
DNS Monitoring
A, AAAA, CNAME, MX, NS, and TXT records are checked and compared against their previous values - so an unexpected DNS change (yours or an attacker's) is flagged immediately.
Response Time Monitoring
A full timing breakdown per check - DNS lookup, TCP connect, SSL handshake, time to first byte, and total time - classified as Excellent/Good/Slow/Critical against thresholds you can tune.
Security Headers
HSTS, Content-Security-Policy, X-Frame-Options, X-Content-Type-Options, Referrer-Policy, Permissions-Policy, COOP, COEP, CORP, and the legacy X-XSS-Protection header - scored out of 100 with specific, actionable recommendations.
Robots.txt & Sitemap Monitoring
Confirms robots.txt and your XML sitemap are present and accessible, with the Last-Modified date where available - so search engines can always find and index your content.
Website Health Score
All 8 signals combined into one weighted 0-100 score with an A+-F grade, plus a clear breakdown of strengths, issues, and recommended next steps for every website.
PDF Reports
Client-ready branded PDF reports - executive summary, full health score breakdown, incident timeline, charts, issues found, and recommended actions - generated on demand for any date range.
Email Alerts
Alerts fire only on an actual status change - never a repeat while nothing's changed - with a cooldown period and daily/monthly limits so your inbox never gets flooded.