Core Web Vitals Visualizer

Measure, visualize, and debug Core Web Vitals in real time. CrUX history, LCP/CLS/INP breakdowns and performance experiments

Users10K

Rating4.9

Reviews18

Manifest versionV3

7-day growth0

7-day growth rate0%

Preview

Core Web Vitals Visualizer Media preview

6 assets

Trend

30-day user trend

Review user movement over the last 30 days.

User Growth Over Time

Rating trend

30-day rating change

Track rating movement over time to see whether quality signals remain stable.

30-day rating change

Start

4.94

Latest

4.94

30-day rating change

0.00

2026年5月29日2026年6月4日

Growth overview

Daily, weekly, and monthly growth

Compare 1-day, 7-day, and 30-day net growth and growth rate.

1-day growthFlat

00%

7-day growthFlat

00%

30-day growthFlat

00%

Technical snapshot

Version, languages, and crawl freshness

Review publication date, version, supported languages, and crawl timestamps.

Version1.20

ManifestV3

Size2.51MiB

Languages1English

Published--

Store updated--

Last crawled--

Overview

Product summary

Review the store description, core capabilities, and common use cases.

Core Web Vitals Visualizer

Open the popup on any page. See your LCP, CLS, INP, FCP, and TTFB scores instantly, color-coded, live. No separate tool. No copy-pasting URLs into PageSpeed Insights.

What it shows

Real-time scores powered by the web-vitals library, the same library Chrome uses internally. Green means good. Orange means work to do. Red means it's hurting you.

LCP - Green overlay marks the LCP element on the page. Full timing breakdown: TTFB, Resource Load Delay, Resource Load Duration, Element Render Delay. For images: preload status, fetchpriority, 1st vs 3rd party origin, natural vs rendered dimensions, estimated preload savings.

CLS - Pink overlays mark every layout shift source. Click any shift to see an animated before/after replay. Attribution shows the largest shift target and score.

Reviews

Recent review snapshot

Inspect the latest comments and rating distribution.

The Chrome Web Store shows 18 reviews, but only 0 review bodies have synced into ExtScope so far. Showing the synced reviews available right now.

5★

4★

3★

2★

1★

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AI product read

Real-time Core Web Vitals measurement, visualization, and debugging tool for web developers

Developers must copy URLs into separate tools like PageSpeed Insights to check Core Web Vitals. This extension provides instant, live, on-page measurement and visualization of CWV metrics with detailed breakdowns and visual overlays, eliminating context-switching.

User opens the extension popup on any webpage. The extension measures CWV metrics in real-time using the web-vitals library (same as Chrome internally). The main view shows live scores for LCP, CLS, INP, FCP, TTFB with color-coded badges. User can click each metric for detailed breakdowns, visual overlays on the page (LCP element highlight, CLS shift pink overlays with animated replays), and attribution data. The CrUX tab fetches 25 weeks of field data from Google's CrUX API. The Scan/Audit tabs perform static analysis for image sizing and font issues. The Experiments tab lets users toggle 3rd-party resource blocking to test performance impact.

Target users: Web developers / Front-end engineers / Performance engineers / SEO professionals focused on Core Web Vitals / Web performance consultants

No login or payment keywords were found anywhere in source, providing strong negative evidence
External services (coredash.app, treo.sh, corewebvitals.io) may have their own account/payment models but this is outside the extension's scope
The hardcoded CrUX API key is a design choice by the developer, not user-provided credentials

Monetization

No paid features detected

The extension itself contains no paid features, gating, payment UI, billing APIs, or license checks. All 'paid' keyword matches are false positives: CSS class names like '--improve-color' (orange status color), 'pro' in generic TLD lists, 'plans' in internal design docs. The extension links to external products (Core/Dash at coredash.app, Treo, corewebvitals.io/signal) via promotional taglines, but these are outbound links to separate products, not gated features within the extension.

Confidence: 95
Payment platform: --
Source: AI / High
Login required: No
Reason: No login, authentication, account creation, or credential input is required to use the extension. All features work locally in the browser. The 'session' hits are sessionStorage for storing experiment toggle state locally, not user authentication. The extension calls the public CrUX API with a hardcoded API key—no user credentials needed.

Permission risk

High-risk permissions

This estimate uses declared permissions and host permissions to assess access scope and sensitivity.

敏感权限：debugger

Publisher

MarketingTracer

Arjen Stephan Karel

Email: [email protected]
Phone: +31611335450
Address: Hyacintenveld 68 Bergen Op Zoom 4613DL NL

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Permissions

Host access