CrawlGraph is a backlink and competitor-gap tool built on Common Crawl snapshots. It returns referring domains with authority fields and compares competitors through a link-gap endpoint. It does not run a live daily crawler. The free website query returns five referring domains without signup; paid plans unlock full lists, CSV/JSON export, gap analysis and API access.
DNSai is a collection of DNS and email security tools on one page. It covers DNS record lookups, WHOIS, blacklist checks, SPF, DKIM and DMARC builders and validators, email header analysis and bulk domain scanning. The tools return plain-English AI summaries, and each is available through an API and MCP connectors.
SSL Server Test is a free online service from Qualys SSL Labs that performs a deep analysis of the configuration of any SSL web server on the public Internet. The site states that submitted information is used only to provide the service.
digga is a free domain and infrastructure research tool that looks up DNS records, RDAP and WHOIS data, subdomains, IP details and email authentication in one report. It supports many DNS record types and passive subdomain enumeration. The project is open source under AGPL 3.0 with no accounts or paywalls.
InfoSniper is a free IP address lookup service that locates an IP on an interactive map with city, region, country, ISP, ASN, timezone and coordinates, supporting IPv4 and IPv6. It also offers XML and JSON REST APIs requiring an API key for IP geolocation data.
DNSViz is a tool for visualizing the status of a DNS zone. It was designed to help understand and troubleshoot deployment of the DNS Security Extensions, providing a visual analysis of the DNSSEC authentication chain and resolution path and listing configuration errors it detects.
SmallSEOTools is a collection of free SEO tools for checking backlinks, tracking keyword positions and more. It groups text analysis, image editing, keyword, backlink, website management, tracking, domain and meta tag tools. A separate paid plan covers plagiarism checking, image search and related features.
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DNSai is a collection of DNS and email security tools on one page. It covers DNS record lookups, WHOIS, blacklist checks, SPF, DKIM and DMARC builders and validators, email header analysis and bulk domain scanning. The tools return plain-English AI summaries, and each is available through an API and MCP connectors.
SSL Server Test is a free online service from Qualys SSL Labs that performs a deep analysis of the configuration of any SSL web server on the public Internet. The site states that submitted information is used only to provide the service.
digga is a free domain and infrastructure research tool that looks up DNS records, RDAP and WHOIS data, subdomains, IP details and email authentication in one report. It supports many DNS record types and passive subdomain enumeration. The project is open source under AGPL 3.0 with no accounts or paywalls.
InfoSniper is a free IP address lookup service that locates an IP on an interactive map with city, region, country, ISP, ASN, timezone and coordinates, supporting IPv4 and IPv6. It also offers XML and JSON REST APIs requiring an API key for IP geolocation data.
DNSViz is a tool for visualizing the status of a DNS zone. It was designed to help understand and troubleshoot deployment of the DNS Security Extensions, providing a visual analysis of the DNSSEC authentication chain and resolution path and listing configuration errors it detects.
SmallSEOTools is a collection of free SEO tools for checking backlinks, tracking keyword positions and more. It groups text analysis, image editing, keyword, backlink, website management, tracking, domain and meta tag tools. A separate paid plan covers plagiarism checking, image search and related features.
