> web-vitals is Google Chrome's library for measuring Core Web Vitals on real visits: what it does on your site and what it means for GDPR consent. > > Canonical: https://www.flowconsent.com/en/services/analytics/web-vitals Analytics # web-vitals Unclassified · [Official website](https://github.com/GoogleChrome/web-vitals) web-vitals is a small open source JavaScript library from the Google Chrome team that measures Core Web Vitals such as LCP, INP and CLS in real visitors' browsers. It only collects the metrics and hands them to the site's code; where they are sent depends on the developer, for example an analytics tool, which then determines the consent needs. [Block web-vitals until consent](https://app.flowconsent.com/auth/sign-up?utm_source=flowconsent.com\&utm_medium=referral\&utm_campaign=analytics) · [Scan my site](https://www.flowconsent.com/en/scan) At a glance - Category [Analytics](https://www.flowconsent.com/en/services/analytics) - Consent Unclassified - Prior consent Required - Documented cookies 0 Compliance ## web-vitals and the GDPR web-vitals is classified as “Unclassified”. On a site that targets European visitors, it must only load after the visitor consents, and it must be listed in your cookie policy. Cookies and trackers ## What web-vitals sets and contacts The cookies of web-vitals are not documented in the catalog yet. To see what is actually set on your site, run a free scan. [Scan my site](https://www.flowconsent.com/en/scan) Related guide ## Our guides on web-vitals [6 April 2026](https://www.flowconsent.com/en/blog/cmp-web-performance-impact-core-web-vitals) ### [CMP and Web Performance: What Impact on Your Core Web Vitals?](https://www.flowconsent.com/en/blog/cmp-web-performance-impact-core-web-vitals) [Is your CMP slowing down your site? CMP script weight benchmarks and their impact on CLS, LCP, and INP. Comparison and best practices.](https://www.flowconsent.com/en/blog/cmp-web-performance-impact-core-web-vitals) [Read the guide](https://www.flowconsent.com/en/blog/cmp-web-performance-impact-core-web-vitals) Same category ## More services: Analytics [See the whole category](https://www.flowconsent.com/en/services/analytics) ### [Clicky](https://www.flowconsent.com/en/services/analytics/clicky) [Clicky is an analytics and measurement platform providing deep insights into digital ecosystem performance. 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