B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
0.28x
0.28x -- spearman correlation with rankings for Surfer Content Score (2026)
Surfer's Content Score has a 0.28 Spearman correlation with Google rankings based on Ahrefs research cited by SurferSEO.
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
0.28x
Unit
Ratio
Data Vintage
2026
Entity
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
Ahrefs
Primary
Tier B
https://www.hubstic.com/resources/blog/ai-seo-tools ↗
Source Article
AI SEO Tools in 2026: The Complete Stack for SaaS Teams
On January 27, 2026, Google switched AI Overviews globally to Gemini 3. Within sixty days, SE Ranking measured that the upgrade replaced 42% of previously cited domains and generated 32% more sources per response. Two months later, Google's March 2026 spam update finished rolling out in under twenty…
Original Research
Ahrefs
· Original study ↗
Methodology
Ahrefs research cited by SurferSEO
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
Surfer Content Score: 0.28x spearman correlation with rankings. Source: Ahrefs (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/surfer-content-score-correlation-2026
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<blockquote cite="https://lighthousedata.io/data/surfer-content-score-correlation-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>0.28x</strong> -- spearman correlation with rankings for Surfer Content Score<br><small>Source: Ahrefs (2026) · <a href="https://lighthousedata.io/data/surfer-content-score-correlation-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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