Page Speed Checker
Core Web Vitals overlay on any page
Displays LCP, FID, and CLS scores as an overlay on any website. Instant performance feedback without leaving the browser.
How It Works
Install
Add from Chrome Web Store. No account needed.
Click
Click the extension icon on any page.
Done
Instant results. Works everywhere.
The Problem
Switching to PageSpeed Insights breaks flow
Hard to compare performance across multiple pages quickly
No real-time CWV feedback during development
Features
Live CWV Overlay
LCP, FID, and CLS shown as a non-intrusive badge on every page.
Color-Coded Scores
Green/orange/red thresholds matching Google guidelines.
History Log
Track score changes across pages in the current session.
One-Click Lighthouse
Open a full Lighthouse report from the overlay.
Permissions Transparency
We believe in full transparency. This extension only requests what it needs:
We never access your browsing history, passwords, or personal data.
Free to Use
No credit card. No account. Just install.
Free
- LCP / FID / CLS overlay
- Color-coded thresholds
- Session history
Frequently Asked Questions
Is data sent to any server?
No — all measurements run locally in your browser.
Does it work on localhost?
Yes, including local dev servers.