SEO Analysis

LLMSE performs comprehensive SEO analysis with 96+ automated checks across 20 categories, assigning grades from A to F based on technical factors that impact search engine visibility.

SEO Grading System

Every website classified by LLMSE receives an SEO grade based on technical optimization factors:

A Excellent (90-100) — Highly optimized with comprehensive meta tags, proper structure, and best practices
B Good (80-89) — Well-optimized with minor improvements possible
C Average (70-79) — Basic SEO in place but missing important optimizations
D Below Average (60-69) — Significant SEO issues that need attention
F Poor (<60) — Critical SEO problems affecting search visibility

What We Analyze

The SEO analyzer performs 96+ checks across 20 categories. Here's what we examine:

Core SEO Elements

  • Title Tag — Presence, length (50-60 chars), emptiness, and duplication with H1
  • Meta Description — Presence, length (150-160 chars), and content quality
  • Heading Structure — H1 presence/multiplicity, heading hierarchy, empty headings
  • Canonical URLs — Presence, empty href, relative vs absolute URLs

Content Quality

  • Word Count — Thin content (<300 words) and very thin (<100 words) detection
  • Paragraph Structure — Proper paragraph tags and long paragraph detection (>150 words)
  • List Usage — Presence of ul/ol on content-heavy pages for readability

Image Optimization

  • Alt Text — Missing or empty alt attributes
  • Dimensions — Width/height for CLS prevention
  • Modern Formats — WebP/AVIF usage detection
  • Responsive Images — srcset attribute usage
  • Filenames — Descriptive vs generic (IMG_, DSC_) filenames
  • LCP Optimization — lazy loading on above-fold images, fetchpriority hints

Link Analysis

  • Internal Links — Presence and count (3-10 recommended)
  • External Links — Presence and excessive count (>100)
  • Link Text — Empty text, generic text ("click here"), accessibility
  • Link Quality — Mixed content (HTTP on HTTPS), nofollow on internal links

Technical SEO

  • Viewport — Presence, zoom prevention, fixed width issues
  • Language — HTML lang attribute, hreflang tags for multi-language sites
  • Character Set — UTF-8 charset declaration
  • Robots Directives — noindex, nofollow, noarchive, nosnippet, none
  • URL Structure — Length (<100 chars), uppercase, underscores, special characters
  • DOCTYPE — HTML5 doctype declaration
  • Duplicate IDs — Unique element ID validation

Structured Data

  • JSON-LD — Presence and syntax validation
  • Article Schema — Article/BlogPosting for content pages
  • Product Schema — Product schema for e-commerce
  • FAQ Schema — FAQPage for FAQ sections
  • HowTo Schema — HowTo for step-by-step content
  • Review Schema — Review/AggregateRating for ratings
  • Breadcrumb Schema — BreadcrumbList for navigation
  • Organization Schema — Organization for homepage identity
  • Video Schema — VideoObject for video content

Social Media Tags

  • Open Graph — og:title, og:description, og:image
  • Twitter Cards — twitter:card, twitter:image

Performance & Core Web Vitals

  • Render Blocking — CSS/JS blocking resources in head
  • Font Display — font-display property for web fonts
  • Preconnect — Hints for third-party domains
  • DOM Size — Element count (<1500 recommended)
  • DOM Depth — Nesting levels (<32 recommended)
  • CSS Placement — Stylesheets in head vs body

Accessibility

  • Landmarks — HTML5 semantic elements (main, nav, header, footer)
  • Skip Links — Skip to main content navigation
  • Button Names — Accessible names for buttons
  • Form Labels — Labels for form inputs
  • Iframe Titles — Title attributes on iframes
  • Table Headers — th elements with scope in data tables

E-E-A-T Signals

  • Author — Author attribution for articles
  • Dates — Publish date and last modified date
  • Contact Info — Contact page links, mailto/tel links, address tags

Security

  • HTTPS — Secure connection validation
  • Mixed Content — HTTP resources on HTTPS pages

Favicon & Icons

  • Favicon — Standard favicon presence
  • Apple Touch Icon — iOS home screen icon

SEO Grade in Search Results

When you classify a website through the web interface or browse classified URLs, you'll see the SEO Grade displayed alongside other classification data like category, language, and sentiment.

The grade provides a quick at-a-glance indicator of how well a site is optimized for search engines. This is useful for:

  • Competitive analysis — Compare SEO quality across sites in a category
  • Quality filtering — Find well-optimized sites in specific topics
  • Research — Understand SEO trends across different industries

Full Reports via MCP & API

While the web interface shows only the letter grade, the MCP tool and REST API provide full analysis reports with 96+ checks:

Critical Issues — Problems that severely impact SEO (missing title, noindex, etc.)
Warnings — Issues that should be addressed (thin content, poor structure, etc.)
Informational — Optimization opportunities (schema, social tags, etc.)
Meta Information — Extracted title, description, headings, word count
Recommendations — Actionable fixes for each issue found
Numeric Score — Precise 0-100 score with letter grade

MCP Server

Use the analyze_seo tool through your AI assistant:

"Analyze the SEO of https://example.com"

Set up via the LLMSE Public MCP server.

REST API

Call the SEO endpoint directly:

GET /api/v1/seo?url=https://example.com

See full parameters and response schema in the interactive API docs.

Browse by SEO Grade

You can browse and filter classified websites by their SEO grade:

seo Grade A (Excellent) ?seo=A
seo Grade B (Good) ?seo=B
seo Grade C (Average) ?seo=C
seo Grade D (Below Average) ?seo=D
seo Grade F (Poor) ?seo=F

Advanced SEO Queries

Combine SEO grade with other filters using advanced search syntax:

q Grade A Technology sites seo:A cat:Technology
q Well-optimized English sites seo:A lng:English
q WordPress sites with good SEO seo:B app:WordPress

See all available filters on the query examples page.

SEO Distribution Statistics

View the distribution of SEO grades across all classified websites on our Market Share page. The SEO Grades chart shows how websites are distributed across the A-F grading scale.