Issues Reference

Every issue SEODiff detects during a site scan. Issues are classified by severity and category, with impact scores based on how many pages are affected.
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Critical & High Severity

These issues have the largest impact on your scores. Fix them first.

Fetch Errors Critical
Pages that failed to load — connection errors, timeouts, or parse failures.
Non-200 Responses High
Pages returning 3xx, 4xx, or 5xx status codes.
Broken Internal Links High
Links pointing to pages that return errors.
Exact Duplicates High
Pages with identical content within the same template.
Placeholder Content High
Pages with lorem ipsum, TODO, or stub content.
Noindex Detected High
Pages with noindex that won't appear in search results.
Orphan Pages High
Pages with no internal links pointing to them.
Canonical Variant Conflict High
URL variants (www/non-www, trailing slash) with conflicting canonicals.

Medium Severity

Thin Content Medium
Pages with fewer than 120 words or less than 18% unique text.
Missing Canonical Medium
Pages without a <link rel="canonical"> tag.
Canonical Mismatch Medium
Canonical URL differs from the actual page URL.
Missing Title Medium
Pages without a <title> element.
Similarity Risk Medium
Pages with high text similarity and low information gain (InfoGain < 45).
Duplicate Clusters Medium
Groups of 2+ pages with near-identical content.
Schema Missing Required Fields Medium
JSON-LD present but missing fields required for rich results.
Missing H1 Medium
Pages without an H1 heading element.
Meta Description Missing Medium
Pages without a meta description tag.
Canonical Chain Medium
Canonical points to a page whose canonical points elsewhere.
Internal Link Redirect Waste Medium
Internal links pointing to redirected URLs instead of final destinations.

Low Severity

Missing Schema Low
No JSON-LD structured data on the page.
Title Length Low
Title shorter than 15 or longer than 70 characters.
Meta Description Length Low
Description shorter than 70 or longer than 190 characters.
Multiple H1 Low
Page has more than one H1 element.
Hreflang Invalid Low
Missing self-referencing hreflang or duplicate language codes.
Accessibility Hygiene Low
Missing html lang, images without alt, unlabelled inputs.

How severity affects scores

Each severity level has a weight used to calculate impact scores:

Critical = 20  |  High = 12  |  Medium = 7  |  Low = 3

Impact formula: severityWeight × affectedPages + 5 × templatesHit

Issues are automatically suppressed when sample coverage is too low to produce reliable results.