100% free · no signup
Free website & security tools
Paste a URL, get real results in seconds — an A+–F grade, the exact problems, and copy-paste fixes. No account, no credit card.
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Website Security Score
One URL in, one composite A+–F grade across headers, TLS, email and reputation — with the single most important fix surfaced first. headers · TLS · email · reputation Get your security scoreSecurity Header Checker
Grade your HTTP security headers A+–F and get copy-paste fixes for nginx, Apache, Caddy and PHP. CSP · HSTS · X-Frame-Options Run free checkSSL Certificate Checker
Check any certificate’s expiry countdown, chain, protocol, cipher and fingerprint. TLS · expiry · chain Run free checkDMARC, SPF & DKIM Checker
Look up your email-security records and stop attackers spoofing your domain. SPF · DKIM · DMARC Run free checkDNS Lookup
Resolve A, AAAA, MX, NS, TXT and CNAME records in one place. A · MX · NS · TXT · CNAME Run free checkDNS Propagation Checker
See how far your DNS change has spread — live answers from 21 resolvers worldwide on a map. propagation · TTL · worldwide Run free checkWebsite Uptime Test
Is your website down right now? Check status, latency and TTFB from our server. status · latency · TTFB Run free checkSLA & Downtime Calculator
Turn 99.9% into minutes of allowed downtime — or your actual downtime into an availability percentage. 99.9% · downtime · nines Run free checkCron Expression Explainer
Paste a cron expression, get plain English and the next 10 run times in your timezone. cron · schedule · next runs Run free checkIP Subnet Calculator
CIDR in, everything out: network, broadcast, usable range and host count for IPv4 and IPv6. CIDR · IPv4 · IPv6 Run free checkCAA Record Generator
Build correct CAA records for your CAs and check what a domain currently allows to issue. CAA · issue · issuewild Run free checkCertificate Decoder
Paste a PEM certificate (or chain) and read its subject, SANs, validity, key and signature. PEM · x509 · SANs Run free checkSPF Record Checker
Parse your SPF record, walk every include and count DNS lookups against the 10-lookup limit. SPF · includes · 10 lookups Run free checkRedirect Chain Tracer
Follow every redirect hop — status, latency, TLS and cookies — and see what the chain costs you. 301 · 302 · hops · latency Run free checkEmail Blacklist Checker
Check an IP or domain against a dozen DNSBLs at once, with delisting links for anything found. DNSBL · Spamhaus · delisting Run free checkTLS Protocol Scanner
See which TLS versions a server accepts — 1.0 through 1.3 — with the negotiated cipher and a grade. TLS 1.3 · ciphers · grade Run free checkEmail Header Analyzer
Paste raw email headers and get the hop-by-hop delivery timeline, delays and SPF/DKIM/DMARC verdicts. Received · delays · spoofing Run free checkThese are the real checks — not a demo
The checkers here run the same engine CompleteStatus uses for its monitors. Try them free as one-off checks — then add a monitor to run the matching check on a schedule, confirm issues with a second consecutive check, and alert you when something breaks.
Frequently asked questions
Yes — every tool here is completely free, needs no signup and only scans public websites. They run the same engine CompleteStatus uses to monitor sites continuously.
No account is required. Paste a URL or domain and get real results instantly. Create a free CompleteStatus account only if you want continuous monitoring and alerts.