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SEOComet

SEOComet SEO Toolbar

Free SEO Chrome extension

Check the on-page SEO of the page you’re on in one click: titles, indexing, structured data, social tags, images, links and headers, with a list of what to fix.

Add to Chrome (opens the Chrome Web Store in a new tab)

Free, no account

The toolbar popup open on the Overview tab for www.seocomet.com. The menu on the left lists Overview, Content, Indexability, Structured data, Social, Images, Links, HTTP headers and Settings, with issue counts. The page summary shows status 200 with no redirects, title 52 of 60 characters, description 130 of 160, self-canonical, indexable, one H1 and 1,279 words, then issues by section.

The first tab, pictured above

Overview: the page at a glance

Open the toolbar and the Overview tab answers the usual questions first. Every tab in the menu carries its issue count, coloured by how serious the worst one is, so you know where to look next.

  • Status code and any redirects
  • Title and description length
  • Canonical, and whether it points to the page itself
  • Indexable or not, and why
  • H1 count and word count
  • Issues for each section
  • Core Web Vitals when you press the button

Every tab in the popup

Each tab looks at one part of the page and lists its problems at the top, marked critical, warning or info.

Content

Every title and meta description on the page, from the HTML the server sent and from the page after JavaScript ran, so a second title added by a script doesn’t go unnoticed.

  • Title and description length against 60 and 160 characters
  • A flag on any title or description that isn’t in the <head>
  • Published and modified dates, and the word count
  • The heading outline, H1 to H6, with a button to copy it
The Content tab for www.seocomet.com: the title at 52 of 60 characters, the meta description at 130 of 160, published and modified dates not found, 1,279 words, and the first of 19 headings with a Copy headings button.

Indexability

Whether search engines can index the page, and which rule decides it.

  • Meta robots and the X-Robots-Tag header
  • Whether robots.txt allows the page, quoting the rule that matched
  • The sitemaps listed in robots.txt
  • Canonical from the HTML, the rendered page and the Link header, and hreflang
The Indexability tab: the canonical is self-canonical in the rendered HTML and the HTML source and missing from the HTTP header, robots.txt allows the page, no meta robots or X-Robots-Tag, one sitemap found through robots.txt, and no hreflang links.

Structured data

JSON-LD and microdata laid out as a tree you can fold, with what each type is missing.

  • Missing required and recommended fields for each type
  • Nested entities shown under their parent
  • A Validate menu that opens the page in Google’s Rich Results Test or the Schema.org validator
The Structured data tab: 3 JSON-LD blocks with 3 entities, a note that Organization is missing sameAs, the Organization fields as a tree, and a WebSite entity with no issues. A Validate menu sits top right.

Social

How the page will look when someone shares it, and the tags behind that.

  • Open Graph and X (Twitter) tags, listed in full
  • Share previews built from those tags
  • Checks on the share image’s size
The Social tab: a share preview card with the page’s Open Graph image, domain, title and description, followed by the og:title, og:type, og:image, og:url, og:site_name and og:description tags.

HTTP headers

The redirect chain hop by hop, with the full response headers for each step.

  • 301, 302, 307 and 308 redirects
  • JavaScript redirects and meta refresh
  • Every header of every response
The HTTP headers tab: a single final response for https://www.seocomet.com/ with status HTTP/1.1 200, followed by its headers, including server, date, content-type, last-modified, vary and cf-cache-status.

Images

Every image on the page with its alt text and dimensions. Press the button to fetch file sizes. Filter the list and export it as CSV.

Settings

A light, dark or system theme, which tab the toolbar opens on, the exclude list, the SEO bar on or off and at the top or bottom of the page, and your own CrUX API key.

On the page itself

The SEO bar

Press Alt A, or Ctrl ⌘ A on a Mac, for a strip across every page you visit. You see the basics as you browse without opening anything.

  • Status, title and description length, indexable, canonical, H1 count, words and issue count
  • Web Vitals and Details buttons
  • Hide it on one page or on a whole domain
  • Off until you turn it on, and never shown on web apps like Gmail, Docs, YouTube or Google search
The SEO bar across the top of www.seocomet.com: status 200, title 52 of 60, description 130 of 160, indexable yes, self-canonical, one H1, 1,279 words and no issues, with Web Vitals and Details buttons and a close button on the right.

For pages built with JavaScript

Raw HTML next to the rendered page

Put the HTML the server sent next to the page after JavaScript ran. A summary table shows where the title, description, canonical, robots, H1, JSON-LD blocks and link count differ. Below it, a side-by-side line diff of the HTML or of the visible text, with a switch to show the changes only.

The raw vs rendered page for www.seocomet.com: a table comparing title, meta description, canonical, meta robots, H1 and JSON-LD blocks, all the same, and links, 46 in the raw HTML against 45 rendered. Below, HTML and Visible text switches, All lines and Changes only switches, and the two versions of the HTML side by side with line numbers.

Also in the toolbar

  • A count on the icon

    The toolbar icon shows how many issues each page has as you browse: red when something is critical, yellow for warnings, and a green tick when the page is clean.

  • Core Web Vitals

    LCP, CLS and INP from the Chrome UX Report, which is real-user data. If the page has too little traffic, you get the figures for the whole site. Add your own CrUX API key in Settings if you like.

  • An exclude list

    Sites and pages on the list get no badge on the icon and no SEO bar. You can still open the toolbar there.

Your data stays in your browser

The toolbar is free and needs no account. Nothing is sent to SEOComet. It talks to the site you’re checking, to Google’s Chrome UX Report API when you ask for Web Vitals, and to the image and link addresses on the page when you press a check button. The toolbar section of the privacy policy has the details.

Help with the toolbar

Something not working? The support page answers the common questions and says what to send us.

The toolbar checks one page at a time. SEOComet will also watch a whole site’s sitemap, robots.txt and ads.txt and tell you when they change. It isn’t open to the public yet, so join the waitlist to hear when it is.

Join the waitlist