PageSpeed and Lighthouse Audit
Enter a URL and choose mobile or desktop: the tool queries Google's PageSpeed Insights API and clearly separates the lab test from real-user data.
Temporarily unavailable
Privacy and cost
This tool runs a live check on our servers. Free accounts get 3 live checks per day in total across all such tools. We keep your report in your account so you can delete it any time.
How it works
- You choose the strategy (mobile or desktop) and the Lighthouse categories to compute.
- Our server calls the PageSpeed Insights v5 API; the result is cached for 6 hours and 429/5xx errors are retried.
- You get two distinct blocks: lab data (Lighthouse: scores, metrics, opportunities) and field data (CrUX: 75th percentile over 28 days).
Example
A page can score 62 on performance in the lab test while showing a field LCP of 4.2 s: these are two different measurements, shown in two blocks.
What the result means
The Lighthouse score comes from a single simulation on Google's servers and varies between runs: it is not your visitors' experience. CrUX field data reflects real Chrome users but only exists when the URL or origin has enough traffic.
Common problems this tool helps with
- Mistaking the lab score for real Core Web Vitals.
- Render-blocking resources or heavy images delaying LCP.
- High blocking time caused by too much JavaScript.
- Mobile and desktop gaps missed for lack of a separate test.
Frequently asked questions
Why is the tool unavailable?
It depends on a PageSpeed Insights API key configured on the server. Without one the tool is disabled rather than returning fake values.
Why two different results?
The lab simulates a given device and network; the field aggregates real visitors. Google uses field data for Core Web Vitals.
Are results real-time?
They can be up to 6 hours old: we cache an analysis to save API quota.
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