Free website speed test on a phone: Core Web Vitals in plain English
Type an address to see how its homepage loads on a phone, using Google's Lighthouse and, where Chrome has the data, real visitors. You get the three Core Web Vitals against Google's targets, and what's slowing the page down.
Free, and only reads what any visitor can see.
What it checks
- Largest Contentful Paint: when the main content appears
- Cumulative Layout Shift: how much the page jumps while loading
- Interaction to Next Paint, where real-visitor data exists
- Page weight, scripts, third-party hosts and server response time
Reading the result
- Real visitors or a simulated phone
- When Chrome has enough visits to the site, the figures come from real people. Otherwise they come from Lighthouse on a simulated mid-range phone.
- Google's targets
- Main content in 2.5 seconds or less, a response to taps in 200 milliseconds or less, and layout shift of 0.1 or less.
Understand the result
- Website speed and enquiries: what Core Web Vitals mean for a local business
Google's three Core Web Vitals in plain English, the scores to aim for, and why a faster page brings more enquiries.
The other free checks: accessibility checker, wordpress vulnerability checker, security headers checker and php version checker. Or run the full scan, which does all five at once.