If you are a web developer or SEO engineer optimizing for Google's 2026 search ranking signals, you already know that Core Web Vitals (LCP, INP, CLS) make or break user experience and search rankings.
Opening Chrome DevTools, throttling CPU, or loading heavy web dashboards just to run a quick test on a staging or production URL can slow down your workflow.
To solve this, we built a lightweight, zero-dependency CLI tool and diagnostic platform to inspect any webpage's Core Web Vitals directly from your terminal in seconds.
Instant Terminal Audit via npx
You don't even need to install anything permanently. Just run:
npx gtmetrix-cwv https://example.com
**
📊 What It Diagnoses
**
The CLI connects to official PageSpeed and Lighthouse telemetry to extract real-world benchmarks:
INP (Interaction to Next Paint): Measures user interface responsiveness and main-thread blocking latency.
LCP (Largest Contentful Paint): Evaluates perceived loading speed for primary viewport elements.
CLS (Cumulative Layout Shift): Tracks unexpected layout shifts and visual stability.
FCP (First Contentful Paint) & TTFB (Time to First Byte): Benchmarks server response latency and initial document delivery.
**
🛠️ The Complete Diagnostic Suite
**
The terminal inspector is part of our broader open-source performance ecosystem:
Free Web Dashboard: Run unlimited audits, compare mobile vs. desktop scores, and get actionable recommendations at gtmetrix.in
.
Official Chrome Extension: Perform 1-click Core Web Vitals audits on any active tab via the Chrome Web Store Extension
.
NPM Package: View the package release and documentation on npm: gtmetrix-cwv-inspector
.
Author Profile & Engineering Roadmap: Maintained by Rajendra Singh Rathore
(Lead SEO Specialist & Product Growth Strategist).
Give npx gtmetrix-cwv a run on your site, and feel free to share your thoughts or feature requests in the comments below!
Top comments (0)