Alternatives to Check Your Website
Free online checker for a domain's DNS, redirects, certificates, connections and mixed content. The listings below can replace it for an important use case. Each note says what changes if you switch.
The original
Check Your Website
Free online checker for a domain's DNS, redirects, certificates, connections and mixed content.
Replacements
Listings that take over the same core job as Check Your Website.
Internet.nl
A web test that checks websites, mail domains and connections for modern Internet standards support.
Internet.nl tests websites, mail and connections for IPv6, DNSSEC, TLS and DMARC in one place, and can be self-hosted via Docker.
Hardenize
A web site configuration tester and monitoring service for network, certificate and security settings.
Hardenize gives a free configuration report for network, certificate and security settings, adding continuous monitoring for organisations.
SSL Labs Server Test
A Qualys web service that analyses the TLS/SSL configuration of a public web server.
SSL Labs Server Test audits protocols, ciphers and vulnerabilities in more depth, but does not cover DNS, redirects or mixed content.
Webbkoll
A web-based privacy checker for cookies, third-party requests, HTTPS and security headers.
Webbkoll checks HTTPS, redirects and security headers along with cookies and third-party requests, run by a non-profit with source on Codeberg.
ImmuniWeb SSL Security Test
A free online test of the SSL/TLS setup of a web or email server.
ImmuniWeb SSL Security Test focuses on TLS setup for web and email servers, adding compliance checks and PDF export but no DNS checks.
Web Check
Open-source, self-hostable tool that analyses a website's DNS, security, headers and other public details.
Web Check is open source and self-hostable, combining DNS, headers and security checks in one report instead of focusing on HTTPS redirects.
Also worth comparing
These listings name Check Your Website as their own alternative, so the relationship runs both ways.
CDN77 TLS Test
A free web checker from CDN77 that lists the SSL and TLS versions a server supports.
Check Your Website grades certificates, redirects, DNS and connections in one report, with checks queued under a concurrency limit.
httpstatus.io
A web tool for checking HTTP status codes, response headers and redirect chains of URLs.
Check Your Website reports redirects together with DNS, certificates and mixed content for a domain, though checks are queued with a limit on concurrent runs.
Redirect Checker
A free web tool that traces a URL's redirects and reports each status code in the chain.
Check Your Website audits redirects together with DNS, certificates and mixed content with grading, though checks are queued and output is dense.
SSL Shopper SSL Checker
An online checker that verifies a server's SSL certificate installation, chain, hostname and expiry.
Check Your Website combines certificate checks with DNS, redirects and mixed content in one graded report, though checks are queued and output can be dense.
Why No Padlock
Online tool that finds insecure mixed content stopping a page from showing as fully secure.
Check Your Website checks mixed content together with DNS, redirects and certificates in one graded report, though checks are queued with concurrency limits.
Similar software
Related functionality, not a direct replacement.
HTTP Observatory
Mozilla's web tool that grades a site's HTTP security headers and gives fix recommendations.
Security Headers
A web service that analyses a site's HTTP response headers and grades them from A+ to F.
intoDNS
A free web tool that checks a domain's DNS and mail server health and configuration.
