Alternatives to Web Check
Open-source, self-hostable tool that analyses a website's DNS, security, headers and other public details. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Web Check
Open-source, self-hostable tool that analyses a website's DNS, security, headers and other public details.
Replacements
Listings that take over the same core job as Web Check.
Internet.nl
A web test that checks websites, mail domains and connections for modern Internet standards support.
Internet.nl tests websites, mail and connections against standards like IPv6, DNSSEC, TLS and DMARC, and can also run yourself as a Docker package.
Hardenize
A web site configuration tester and monitoring service for network, certificate and security settings.
Hardenize gives a free configuration report on network, certificate and security settings, plus continuous monitoring aimed at organisations.
Check Your Website
Free online checker for a domain's DNS, redirects, certificates, connections and mixed content.
Check Your Website combines DNS, redirects, certificates and mixed content into one graded report, but is a hosted service with queued checks.
Cloudflare Radar URL Scanner
Free Cloudflare web tool that scans a URL and reports its technologies, security and performance details.
Cloudflare Radar URL Scanner reports technologies, security and performance for a URL in one free scan, but is proprietary and cannot be self-hosted.
Webbkoll
A web-based privacy checker for cookies, third-party requests, HTTPS and security headers.
Webbkoll focuses on privacy, covering cookies, third-party requests, HTTPS and security headers in one report, with less DNS detail than Web Check.
Also worth comparing
These listings name Web Check as their own alternative, so the relationship runs both ways.
HTTP Observatory
Mozilla's web tool that grades a site's HTTP security headers and gives fix recommendations.
Web Check is open source and self-hostable with Docker, reporting headers alongside DNS and other security details in one broader overview.
httpx
Inspect HTTP services with ProjectDiscovery's command-line toolkit.
Web Check gives a one-page web report on a single site's DNS, headers and security and can be self-hosted, rather than bulk probing lists of hosts from a terminal.
Netcraft Site Report
A free web lookup that shows the hosting, server software and technologies behind any website.
Web Check is open source and self-hostable with Docker, combining DNS, header and security checks into one report of public details.
Security Headers
A web service that analyses a site's HTTP response headers and grades them from A+ to F.
Web Check is open source and self-hostable, combining header checks with DNS and security details in one broader report.
Similar software
Related functionality, not a direct replacement.
SSL Labs Server Test
A Qualys web service that analyses the TLS/SSL configuration of a public web server.
BuiltWith
A web tool that detects the technologies a website is built with.
ViewDNS.info
A web collection of more than 20 DNS, IP and domain lookup tools, with a paid API.
intoDNS
A free web tool that checks a domain's DNS and mail server health and configuration.
