LightScout - Core Web Vitals Monitor

About

LightScout monitors all 6 Core Web Vitals in real time as you browse. See exactly how every page performs with color-coded ratings based on Google's thresholds.

**Metrics tracked:**
- LCP (Largest Contentful Paint) — loading performance
- FCP (First Contentful Paint) — initial render speed
- TTFB (Time to First Byte) — server response time
- CLS (Cumulative Layout Shift) — visual stability
- INP (Interaction to Next Paint) — responsiveness
- FID (First Input Delay) — interactivity

**Key features:**
- Color-coded ratings: green (Good), yellow (Needs Work), red (Poor)
- Session grouping by domain for easy comparison across pages
- Export metrics as JSON or CSV for spreadsheets and reports
- Optional Google Sheets sync for historical trend tracking
- Tracking toggle to control when metrics are captured
- Badge indicator shows page health at a glance

**Privacy-first:**
All data stays in your browser. Nothing is sent to external servers. No account required — works immediately after install.

**Built for developers, designers, and SEO professionals** who want to understand real-world page performance without leaving the browser.

Free. No premium tiers. No hidden features.

Learn more at https://testscout.dev/lightscout
Privacy policy: https://testscout.dev/lightscout/privacy