Web Vitals Monitor

About

Web Vitals Monitor gives you instant visibility into the four Core Web Vitals metrics that Google uses to evaluate page experience:

▸ FCP (First Contentful Paint) — How quickly the first content appears
▸ LCP (Largest Contentful Paint) — When the main content finishes loading
▸ CLS (Cumulative Layout Shift) — Visual stability of the page
▸ INP (Interaction to Next Paint) — Responsiveness to user input

★ Key Features:
• Real-time monitoring on every page you visit
• Color-coded ratings based on Google's official thresholds (Good / Needs Work / Poor)
• Clean, minimal UI with progress bars
• Auto-refreshing data — CLS and INP update as you interact
• One-click page reload to re-measure
• Zero configuration required
• No data collection — 100% local, privacy-first

★ Rating Thresholds (Google Standards):
• FCP: Good < 1.8s | Poor ≥ 3s
• LCP: Good < 2.5s | Poor ≥ 4s
• CLS: Good < 0.1 | Poor ≥ 0.25
• INP: Good < 200ms | Poor ≥ 500ms

Perfect for web developers, SEO specialists, and performance engineers who need quick page performance checks without opening DevTools.

Lightweight. Fast. No permissions abuse. Just the metrics you need.