About check.uk.app
Understand how your website and email work — and what to fix when something goes wrong.
Why we built this service
check.uk.app is part of the uk.app project. We bring common website and email diagnostics into one place, with readable results and practical explanations. Our aim is to help you find the cause of a problem and check whether a change helped.
Who it is for
Website owners, developers, administrators and SEO specialists can use the tools before a launch, after changing DNS or hosting, or when investigating an error. Basic checks do not require an account.
What you can check
Inspect SSL/TLS certificates, DNS records, redirects, HTTP headers, caching, Gzip and Brotli, robots.txt, sitemaps and indexing signals. Network tools include HTTP/2 and HTTP/3, ping, traceroute and public domain registration data.
A separate test for real email
Send a message to a temporary test address to inspect SPF, DKIM, DMARC, transport, message structure and spam-filter findings. The report explains its score and identifies which reputation lists were actually checked.
From a result to the next step
Open each result to see the evidence, explanation and relevant guidance. Where available, compare observations from a second location. Make a targeted change and run the check again. An optional account provides saved sites and check history.
Clear limits and responsible use
Results describe what our checks observed at that moment. They are not a security certificate, a guarantee of Google indexing or a promise of inbox delivery. Use public targets you are authorized to test; do not send passwords or other secrets in test emails. Data handling and retention are explained on our privacy page.
Questions or ideas?
Tell us about a confusing result, an error or a tool you would find useful.
