Free Online Security Tools

Professional-grade security scanning tools powered by open-source engines. Free — no signup required.

Port Scanner

Nmap-powered. Discover open ports, running services, and versions.

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Subdomain Finder

DNS enumeration + certificate transparency logs + HTTP probing.

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Reverse IP Lookup

Find the hostnames served by an IP — live, via reverse DNS and TLS certificates.

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Safe Browsing Checker

Is a site malware or phishing? Checked against URLhaus, OpenPhish & DNS blocklists — no API keys.

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Website Scanner

OWASP Top 10 — SQLi, XSS, SSRF, CVEs with EPSS scoring.

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SSL/TLS Checker

Certificate validation, TLS versions, cipher suites, Heartbleed & POODLE detection.

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DNS Lookup

All DNS records, SPF, DMARC, DNSSEC validation, zone transfer testing.

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HTTP Headers Checker

9 security headers graded. CSP, HSTS, X-Frame-Options, Referrer-Policy.

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Tech Stack Detector

WhatWeb fingerprinting — CMS, servers, languages, JS libraries, CDN.

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CMS Scanner

WordPress, Joomla, Drupal vulnerability scanner. Plugins, themes, misconfigs.

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Security GPTs for ChatGPT

Prefer working in chat? The same checks are available as free GPT assistants built by Secably — ask in plain English, get records, verdicts and fixes explained.

Is This Website Safe? — URL & Link Safety Checker

Check any link for phishing and malware in chat.

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SSL Checker — Verify Any Website's SSL Certificate

Certificate validity, expiry and TLS issues explained.

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DNS Lookup — Check DNS Records for Any Domain

Read and explain any domain's DNS records.

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Reverse IP Lookup — Find All Websites on an IP

See what else is hosted on an IP address.

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Subdomain Finder — Discover a Domain's Subdomains

Map a domain's subdomains conversationally.

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Open Port Checker — See Which Ports Are Open

Which ports are exposed and what each one means.

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CMS Detector — Find What CMS a Website Uses

Identify WordPress, Joomla, Drupal and more.

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Website Technology Checker — Tech Stack

Full technology stack of any website.

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Website Vulnerability Scanner — Free Scan

Guided OWASP-style security review in chat.

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Security Headers Checker — HTTP Headers

Audit CSP, HSTS and the rest of your headers.

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WHOIS Lookup — Domain Owner & Registration

Registrar, expiry and ownership of any domain.

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IP Address Lookup — Geolocation & Owner

ISP, ASN and location behind any IP.

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CVE Lookup — Explain Any Vulnerability

Severity, exploitation and fixes for any CVE.

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