Stable signalNo paid features detectedMedium-risk permissions

LCP & CLS Monitor

Core Web Vitals Largest Contentful Paint and Cumulative Layout Shift Monitor

Users1KCurrent public install base

Rating5.0Store average score

Reviews2Public review volume

Manifest versionV3Extension platform version

7-day growth0Net users gained this week

7-day growth rate0%Relative weekly velocity

Preview

LCP & CLS Monitor Media preview

3 assets

Trend

User growth trend

Review user movement across collected snapshots.

User Growth Over Time

Rating trend

7-day rating trend

View collected rating snapshots from the latest 7-day window to assess rating stability.

7-day rating change

Start

5.00

Latest

5.00

7-day rating change

0.00

2026年7月13日2026年7月19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.

Version1.01

ManifestV3

Size19.96KiB

Languages1English

Published--

Store updated--

Last crawled--

Overview

Product summary

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

This helps to identify problematic elements causing CLS performance issues on the page by visually highlighting them with a red border. Also in the lower left corner you can watch the change of this indicator while staying on the page.

Reviews

Recent review snapshot

Inspect the latest comments and rating distribution.

Store average score5.0Chrome Web Store aggregate rating, including ratings without synced review text

Synced text average5.0Average computed only from synced review bodies below

Reviews with text1Synced review bodies

Total ratings / reviews2Chrome Web Store public rating/review count

Store average score: 5.0. The bars below are calculated from synced review text only, so they may be empty for extensions that have public ratings but no synced comments yet.

5★

4★

3★

2★

1★

Shahbaz Shamim2024年6月11日

what a wonderful this extension.

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AI product read

Monitor Core Web Vitals (LCP and CLS) on web pages

Helps developers identify and visualize performance issues related to Largest Contentful Paint (LCP) and Cumulative Layout Shift (CLS) on web pages in real-time.

User installs extension -> Opens popup to enable monitoring for current page or entire site -> Background script injects content script and CSS into matching pages -> Content script uses PerformanceObserver API to track layout shifts and largest contentful paint -> CLS score displayed in overlay, problematic elements highlighted with colored borders, LCP logged to console

Target users: Web developers / Frontend engineers / Performance engineers / Web designers

Extension is very simple with minimal UI, no cloud sync beyond chrome.storage.sync
No external API calls except Chrome Web Store update URL
Analysis based on static source code only; runtime behavior assumed to match code

Monetization

No paid features detected

The extension is completely free with no paid features, subscription gates, or billing integration. The 'pro' keyword match in _metadata/verified_contents.json is a Chrome Web Store verification artifact (treehash per file), not a paid tier indicator. No payment platforms, upgrade prompts, or feature gating are present.

Confidence: 100
Payment platform: --
Source: AI / High
Login required: No
Reason: The extension is a local developer tool that runs entirely within the browser. It uses chrome.storage.sync for local preferences but does not implement any login UI, authentication flow, or account creation. It does not redirect to any web service requiring login.

Permission risk

Medium-risk permissions

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

扩展能力较强：storage、scripting

Publisher

Dima Solovei

Independent publisher

Email: [email protected]
Phone: --
Address: --

Public contact fields are shown above. Developer portfolio pages are available on paid accounts.

View developer portfolio

Permissions

Host access