# SEO Extension: Introduction

The VitalSentinel SEO Extension is a free extension for Google Chrome and Microsoft Edge. It checks the page that you have open in the browser. With one click, you see on-page SEO, indexability, Core Web Vitals and technical checks for that page.

The extension does the checks in your browser. Most reports work without a VitalSentinel account. If you sign in, the extension also shows the data that VitalSentinel has for the sites that you monitor.

## Before you start [#before-you-start]

- **Browsers.** Google Chrome or Microsoft Edge, version 120 or later.
- **Account.** You do not need an account for the page reports. To see your VitalSentinel data in the extension, sign in with a VitalSentinel account. See [Sign in](/browser-extension/sign-in).
- **Pages.** The extension checks `http` and `https` pages. It cannot check browser pages, the Chrome Web Store or local files.
- **Install.** See [Install the extension](/browser-extension/install).

## What works with and without an account [#what-works-with-and-without-an-account]

| Feature | Without an account | Signed in |
|---------|--------------------|-----------|
| Page reports: Overview, On-page, Crawl and index, Performance, Technical | Yes | Yes |
| Core Web Vitals measured on your device | Yes | Yes |
| JavaScript switcher | Yes | Yes |
| Domain Rating on the toolbar badge | Yes, if the Domain Rating lookup is on | Yes, if the Domain Rating lookup is on |
| CrUX data, Google Search Console, Google index and Web Analytics data for the page | No | Yes, for the domains that your workspaces monitor |
| **Watch this page**, which adds the page to Page Monitoring | No | Yes, for workspace owners and admins |

## The popup [#the-popup]

Click the VitalSentinel icon in the browser toolbar to open the popup. The popup has a sidebar on the left and the report on the right.

| Sidebar group | Items |
|---------------|-------|
| **This page** | **Overview**, **On-page**, **Crawl and index**, **Performance** and **Technical** |
| **Your site** | **VitalSentinel**. A lock icon shows when you are not signed in |
| **Tools** | The **JavaScript** switch and **Settings** |

A group with more than one report opens when you click it, and shows its reports. A closed group shows the number of issues in its reports. A red number means that at least one issue is an error. An amber number means warnings only.

The bottom of the sidebar shows the **Sign in** button. After you sign in, it shows your name or email address.

The popup remembers the last report for each tab. If you open the popup again on the same address, it opens that report. The popup uses the dark or light mode of your system.

## The reports [#the-reports]

| Report | What it checks | Page |
|--------|----------------|------|
| **Overview** | Status, indexability, title, description, canonical, H1, Core Web Vitals, the main issues and the changes since your last visit | [Overview report](/browser-extension/overview-report) |
| **Content** | Title and description length, the Google snippet preview, headings and meta tags | [On-page reports](/browser-extension/on-page-reports) |
| **Structured data** | JSON-LD items, rich result eligibility, required and recommended properties | [On-page reports](/browser-extension/on-page-reports#structured-data) |
| **Social tags** | Open Graph and X tags, with previews | [On-page reports](/browser-extension/on-page-reports#social-tags) |
| **Images** | Alt text, dimensions, lazy loading, format, size and possible savings | [On-page reports](/browser-extension/on-page-reports#images) |
| **Indexability** | One verdict from status, robots directives, canonical and robots.txt. Also sitemaps, hreflang and raw HTML | [Crawl and index reports](/browser-extension/crawl-and-index-reports) |
| **Crawlers** | Which search engine and AI crawlers robots.txt allows for the page | [Crawl and index reports](/browser-extension/crawl-and-index-reports#crawlers) |
| **Links** | Internal, external and nofollow links, and link status checks | [Crawl and index reports](/browser-extension/crawl-and-index-reports#links) |
| **Performance** | Core Web Vitals on your device, CrUX data, an on-page overlay and a resource audit | [Performance](/browser-extension/performance) |
| **HTTP headers** | Redirect chain, security headers, caching, compression and all response headers | [Technical reports](/browser-extension/technical-reports) |
| **Tech and tracking** | Technologies, trackers, cookies and Consent Mode v2 | [Technical reports](/browser-extension/technical-reports#tech-and-tracking) |
| **Accessibility** | An automated accessibility audit with axe-core | [Technical reports](/browser-extension/technical-reports#accessibility) |
| **AI readiness** | llms.txt, AI crawler rules, content without JavaScript and other checks for AI agents | [Technical reports](/browser-extension/technical-reports#ai-readiness) |
| **VitalSentinel** | The last 90 days of VitalSentinel data for the page | [VitalSentinel tab](/browser-extension/vitalsentinel-tab) |

## Related [#related]

- [Install the extension](/browser-extension/install) - add the extension to Chrome or Edge
- [Privacy and permissions](/browser-extension/privacy-and-permissions) - what the extension sends and why it needs each permission
- [Troubleshooting](/browser-extension/troubleshooting) - answers to common problems