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Core Web Vitals Visualizer

Chrome extension by MarketingTracer · Productivity · Developer

  • Featured
  • Established publisher
  • Trader

A Chrome extension in Productivity · Developer with 10 000 users, an established extension.

No site access is declared in the manifest, so it cannot read the pages you open on its own.

What the developer says, and 5 screenshots

Loading from the Chrome Web Store. Open the listing if it does not appear.

Users
10 000
Rating
4.9 (19 ratings)
Users, last 15 days
unchanged
Rating, last 30 days
Not watched long enough to say
Version
1.21
Updated in the store
2026-06-10
Published
2022-10-29
Manifest
V3
Browser access
1 permission

How it has moved

Users
unchanged since 01.09
10k · 2 readings
  1. 2026-09-0110k
  2. 2026-09-1510k
Rating
unchanged since 01.09
reviewsrating 4.95 · 2 readings
  1. 2026-09-01reviews19rating4.95
  2. 2026-09-15reviews19rating4.95
Users
unchanged since 01.09
10k · 2 readings
  1. 2026-09-0110k
  2. 2026-09-1510k
Rating
unchanged since 01.09
reviewsrating 4.95 · 2 readings
  1. 2026-09-01reviews19rating4.95
  2. 2026-09-15reviews19rating4.95

A dot marks a day the store showed a different number. Between them the line carries the last one forward: we read every listing more than once a day and record a point only when something moves. History beyond ninety days is in the app.

What it can reach

No site access is declared in the manifest, so it cannot read the pages you open on its own.

  • Attach to pages the way developer tools do debugger

The full permission history for this extension

What changed recently

Nothing has moved on this listing since we started watching it.

The publisher

MarketingTracer publishes 3 listings we track, 19k users between them. Listed website: corewebvitals.io.

  1. CLS Visualizer MarketingTracer · Productivity · Developer · published 2020-11-13 9k users ★ 4.4
  2. Website Cache Warmer MarketingTracer · Productivity · Developer · published 2024-09-04 304 users ★ 3.8

Like this one

Listings the catalog judges closest in what they say they do.

  1. Site Speed Insights: Web Vitals Visualizer Describes nearly the same job, smaller audience 21 users
  2. Core Web Vitals Test Describes nearly the same job, smaller audience 8k users ★ 4.9
  3. Site Speed by DebugBear Describes nearly the same job, smaller audience 9k users ★ 4.8
  4. Perform - Core Web Vitals Analyzer Describes nearly the same job, smaller audience 8 users
  5. Testeur performance web Describes nearly the same job, smaller audience 40 users ★ 5.0

The top 5 only. The full comparison, with why each one is close, is on the alternatives page; ranking a whole neighbourhood by your own criteria is in the app.

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Figures come from our own daily pass over the public Chrome Web Store listing, last read on . We publish no contact details for extension developers.