Web Vitals are quality signals key to delivering great UX on the web (https://web.dev/vitals). This extension measures the Core Web Vitals, providing instant feedback on loading, interactivity and layout shift metrics. It is consistent with how these metrics are measured by Chrome and reported to other Google tools (e.g. Chrome User Experience Report, Page Speed Insights, Search Console).
The extension captures:
Largest Contentful Paint
Cumulative Layout Shift
First Input Delay
The extension provides three core features:
1) Ambient Badge – This helps check if a page passing the Core Web Vitals thresholds.
Once installed, the extension will display a disabled state badge icon until you navigate to a URL. At this point it will update the badge to green or red depending on whether the URL passes the Core Web Vitals metrics thresholds.
The badge has a number of states:
* Disabled – gray
* Passing – green
* One or more metrics failing – red
If one or more metrics are failing, the badge will animate the values of these metrics.
2) Detailed drill-down in the popup
Clicking the Ambient badge icon will allow you to drill in to the individual metric values. In this mode, the extension will also say if a metric value might change or requires a user action.
For example, First Input Delay requires a real interaction (e.g click/tap) with the page and will be in a waiting for input state until this is the case. We recommend consulting the web.dev documentation for LCP, CLS and FID to get an understanding of when metric values settle.
3) HUD Overlay
The overlay displays a Heads up display (HUD) which overlays your page. It is useful if you need a persistent view of your Core Web Vitals metrics during development. To enable the overlay:
Right-click on the Ambient badge and go to Options.
Check Display HUD overlay and click ‘Save’
Reload the tab for the URL you wish to test. The overlay should now be present.
I’m having really weird issues with the extension when it comes to CLS. The scores on PS Insights and Chrome Dev Tools consistently report 0.000 CLS for numerous pages, but when I’m using the plugin and I navigate from search or from one of our pages to another, the initial CLS score is always extremely high despite almost no visual layout shift whatsoever. Then, if you reload the page any number of times, the subsequent scores are always 0.000.
If there is some kind of issue with layout shift that the tool is detecting, I would love to know what it is, but the tool doesn’t give you any direction whatsoever as to what elements are causing the layout shift and I can’t replicate that score anywhere else, so I have no idea what to fix. In some cases, I’ve resorted to deleting entire pages on the site and then checking the score with the extension and it will read a crazy high CLS, like 5.74. How can there be such a huge layout shift on a page with no content? Lol. It’s really frustrating.
It’s just PageInsight API, from Google
This extension is terrific. I wanted a way to measure Cumulative Layout Shifts while toggling different pieces of UI in my page. This was harder to do with some of Chrome’s other tools, but the vitals extension made this pretty straight-forward. Great work.
works for me but getting very different (much better) results from https://web.dev/measure, any idea why?
Is good for Largest Contentful Paint & Cumulative Layout Shift but First Input Delay seems to be stuck on waiting for input on a lot of sites (I only got data on 1 of 20 websites I visited).
It doesn’t work for me. Just says “Metrics data unavailable.”. I tried to restart chrome as well but didn’t fix the issue. Would be a very helpful tool for me
Love the extension!
It would be valuable to see mobile metrics vs desktop though as Google looks at the mobile version first of all.
Works very well, gives the CLS value as needed. However, the plugin needs more optimising as it tends to spiral my browser CPU out of control (macbook).
No longer works. Says metrics unavailable
Very Well
Tipp: Um Webseiten direkt miteinander zu vergleichen geh mal auf https://www.elias-lange.de/core-web-vitals-vergleich/ Sehr cool um der Konkurrenz voraus zu sein! 😃👍
Works well
Sehr hilfreich