DiagnoSEO - On-Page SEO & GEO Checker

About

Rank well in search engines. Get cited by AI.

DiagnoSEO runs a complete on-page SEO and GEO (AI-search) audit on any page in one click. It analyzes the page you're viewing and gives you a clear 0-100 score plus specific, actionable issues - all processed locally in your browser, with zero tracking.

WHAT YOU GET

- 0-100 SEO & GEO score - an instant health check of the current page, so you know at a glance what needs work.

- Essential on-page checkpoints - title, meta description, headings (H1-H6), canonical, robots/X-Robots-Tag, status code, viewport, declared language, word count, image alt coverage and more, organized across 8 clean tabs.

- Keyword Placement - check whether your target keyword appears where it matters: title, meta description, H1, subheadings, URL, first paragraph, image alt text and more (12+ scored locations), with in-context highlighting.

- Schema & Technical SEO - structured-data detection, hreflang validation with duplicate detection, redirect detection (whether the page reached its final URL via a redirect), and SEO-relevant response-header checks.

- GEO / AI Overviews readiness - signals that help AI answer engines (such as Google's AI Overviews, ChatGPT and Perplexity) parse and cite your page, including /llms.txt detection and question-form heading checks.

- HTML vs rendered DOM diff - see content that only appears after JavaScript runs, so you know what crawlers actually get versus what users see.

PRIVACY FIRST

- No tracking, no analytics, no ads, no account required.
- All analysis happens locally in your browser.
- Network requests go only to the page you're analyzing - to read its HTML, response headers, favicon and /llms.txt. Nothing is sent to our servers.
- Nothing is stored or retained after you close the popup.

WHO IT'S FOR

SEO specialists, content creators, developers and site owners who want a fast, reliable on-page audit - without sending their data anywhere.

DiagnoSEO is free. Open it on any page and get your score in seconds.