Kunugi Seo Checker

kunugi SEO Checker is a Chrome extension that lets you analyze the SEO status of the page you are browsing with a single click.
No need to open DevTools. It lives in the side panel and automatically refreshes every time you navigate to a new page.
Designed for SEO specialists, web directors, writers, site owners, and anyone else, regardless of technical background.

Note: When installing, you will see a warning that the extension "modifies and permits access to features such as location, camera, and cookies." This is because the extension includes a JavaScript on/off toggle so you can quickly check whether a page contains client-side rendering, something that generative AI crawlers tend to struggle with. Everything runs locally; no data is transmitted, and no cookies or location data are collected.

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Main features

[Panel Data]
- Instantly see whether title and H1 tags are present and what they contain
- Canonical URL settings
- Detection of noindex / nofollow (both meta and per-link)
- Detects and highlights elements likely rendered client-side (CSR)
- Toggle JavaScript on/off to verify CSR impact
- Highlights nofollow links on the page
- HTTP status code display (beta)
- Redirect chain history (301 -> 200 -> JS rewrite, etc.) (beta)
- Cache clear & reload button (equivalent to Ctrl+F5)

[Basics]
- Character count bar for the title tag with recommended range
- Meta description content and length
- Meta keywords check
- Canonical / hreflang validation with warnings
- Counts for images, images without ALT, internal links, and external links
- List and preview of OGP (Open Graph) tags
- List and preview of X Card (formerly Twitter Card) tags
- Copy image / link elements for Excel, or download as CSV

[Headings]
- H1 to H6 heading structure shown as a tree
- Headings inside header / footer are identified and shown separately
- Click a heading to scroll to and highlight it on the page
- Warns when heading levels are skipped (e.g., H2 -> H4)

[Structured Data]
- Detects and displays JSON-LD, Microdata, and RDFa
- Shows match results against Google-recommended schemas
- Checks coverage of required and recommended properties

[Core Web Vitals]
- LCP (Largest Contentful Paint)
- FID / INP (First Input Delay / Interaction to Next Paint)
- CLS (Cumulative Layout Shift)
- Color-coded Good / Needs improvement / Poor for each metric
- One-click link to PageSpeed Insights

[Keyword Analysis]
- Lists keywords on the page in order of frequency
- My Dictionary: register keywords you care about and check whether they appear
- Manage multiple keyword groups using dictionary tags
- Separate counts for registered vs. unregistered keywords

[Tools]
- site: search (supports intitle: and text search modes)
- Element inspector: click an element on the page to see its DOM hierarchy
- Detect and highlight table tags
- One-click access to external tools (PageSpeed Insights, Rich Results Test, Wayback Machine, robots.txt, sitemap.xml)
- Responsive check (beta): switch browser width to preset values to preview phone and tablet layouts

[Google Search Results]
- Automatically shows organic rank numbers on Google search results pages (can be toggled in settings)

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Who it is for

- Writers who want to verify SEO basics before publishing an article
- Directors who need to quickly check the SEO status across multiple sites
- SEO specialists who want to avoid noindex / canonical misconfigurations
- Web staff who are not used to DevTools but still want to understand page structure
- Marketers who want an easy way to inspect structured data and OGP settings

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Highlights

- Lives in the side panel, does not get in the way of browsing
- Auto-detects tab switches and page transitions, refreshing instantly
- Tracks not only HTTP redirects but also URL rewrites via JavaScript (pushState, etc.)
- No data is ever sent to external servers

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v4.0.0 release notes

- HTTP status code display (beta): shows the HTTP response code for the page in the side panel
- Redirect chain display (beta): shows the full chronological history of server-side (301/302, etc.) and client-side (JavaScript URL rewrites) transitions
- Cache clear & reload button: perform a Ctrl+F5-equivalent operation with one click from the side panel
- Toggle for showing Google search rank: turn the rank display on or off from settings
- Improved canonical self-reference detection: URLs with query parameters are now classified correctly
- Renamed Twitter Card to X Card