Free tool

Website Health Checker: Review Speed, SEO and Tracking

Seed Light built this free website health checker for one page URL. Enter the URL to get a report on performance, available Core Web Vitals, on-page SEO basics, tracking tags and technical signals.

Check one page for speed, on-page SEO basics, tracking tags and security signals.

Free to use, with no sign up. The address and result may stay in our server cache for up to ten minutes. Speed checks use Google PageSpeed Insights.

The method

What the checker looks at

01
We fetch the page and response headers
One request to the address you give us, following any redirects, then we read what came back: the HTML your server returned, the headers it sent, and how long it took to answer.
02
PageSpeed Insights provides lab diagnostics
We send your address to Google PageSpeed Insights, the same free service anyone can use. That returns controlled Lighthouse lab data: one simulated load under set conditions, which is repeatable and points at causes.
03
CrUX adds field data where available
The same call returns Google's Chrome User Experience Report, aggregated from real Chrome users over the previous 28-day collection period. Where Google does not publish enough data for the URL or origin, that part reports as not measured rather than as a failure.
04
We inspect page-level technical signals
Titles, descriptions, headings, basic security headers and tracking references are read from what your server returned. These findings apply to the page checked and do not prove the entire website has the same setup.

See how we build websites

Straight answers

Common questions

Common questions about what this check can and cannot tell you.

A website health score can differ between tools since each audit tests and weights a different set of signals. Compare the result with the checks included in each tool and with your current figures, rather than treating two scores as if they measure the same thing.

Both results can be valid because they measure different things. Lighthouse tests one simulated visit under controlled conditions. Field data summarises eligible real-user visits over its collection period. Use Lighthouse to investigate causes and field data to understand reported visitor experience.

Because we would rather say so than invent a figure. The common case is field data: Google only publishes it where a URL or origin has enough Chrome traffic.

Fix anything that prevents a purchase or enquiry first, then address trust and usability problems. Minor polish comes after broken journeys and missing information.

The website health checker is the place to start for a broad view of one page. Use its result to identify which area needs closer attention, then choose a focused tool to review that part against the figures or setup you have now.

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