34.9k stars · MIT · 2.2.0 (2026-07-28), read from /releases/latest and confirmed by ungh.cc as 2026-07-28 · Track this in Scout
One page of about forty public facts about any web address, from hosting and certificates to email records and what a crawler sees.
▶Repo detailsthe review · specs · pros & cons · install
What it is
A web application that runs a long list of independent checks against a domain and lays the answers out as cards. Each card is a separate check, and any of them can be switched off.
What it is good for. Anyone who owns a domain and has never looked at it from outside. The checks that most often surprise people are the email ones: SPF, DKIM and DMARC are three short records that tell other mail servers which machines may send mail in your name, and when they are missing or wrong your mail quietly goes to spam. It is also the fastest way to answer "what does a crawler see here", because it reads robots.txt, the page structure, the social-preview tags and the security headers in the same pass. And it works on a competitor's domain exactly as well as on your own.
- MIT, and there is a free hosted copy, so the first look costs nothing at all.
- About forty checks in one place, where each would otherwise be a separate website and a separate wait.
- It self-hosts with one container command, which matters because the public copy is rate-limited and because some checks are better run from a machine you control.
- It reports facts and leaves the judgement to you. It will tell you a header is missing; it will not tell you whether that matters for your site.
- Some checks need extra programs installed (a browser for screenshots,
traceroutefor the network path), so a bare install quietly returns fewer answers than the hosted copy. - Running it yourself wants Node.js 22.12 or newer, which is more recent than many servers carry.
janreges/siteone-crawlerIt also audits a site and reports security, SEO and speed problems, but it crawls every page and produces a report file, where this one examines the domain itself.
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StJudeWasHere/seonautIt also finds problems that affect search ranking, but it keeps a history across crawls; this one is a single snapshot.
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harlan-zw/unlighthouseIt also measures a whole site, but it runs Google Lighthouse on every page for speed and accessibility scores, which is a much narrower question.
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# use the hosted copy first — nothing to install # https://web-check.xyz/ # or run your own docker run -p 3000:3000 lissy93/web-check # then open http://localhost:3000
