What is Cumulative layout shift?
When a page jumps while loading — a banner appears, text moves down, you click the wrong button — that is layout shift. Google measures it as CLS, one of the Core Web Vitals.
Features
- Shows the CLS of the current page
- Helps find layout shifts while you browse
- Also covers Largest Contentful Paint (LCP)
How to use it
- Install. Add the extension from the Chrome Web Store.
- Open a page. Load the page you want to check.
- Read the score. Open the extension to see the CLS value.
Product facts
| Developer | Cresotech (PayForSay s. r. o., Slovakia) |
| Version | 1, updated 2025-02-20 |
| Languages | 52 |
| Price | Free |