B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
31%
31% -- purchase intention lift for brand logos and branding with curved (smile-like) lines (2026)
Curved lines in logo and branding can increase purchase intentions by up to 31% because they evoke a smile.
- Upper bound stated as 'up to 31%'
- Full methodology and study details are behind a paywall
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
31%
Unit
Percentage
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
Science Says
Primary
Tier B
https://app.sciencesays.com/p/use-smile-like-lines-in-your-designs ↗
Source Article
Use smile
Original Research
Science Says
· Original study ↗
Methodology
Science-based marketing insight; underlying study methodology not disclosed in excerpt (paywalled). 'Up to' indicates upper bound.
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
brand logos and branding with curved (smile-like) lines: 31% purchase intention lift. Source: Science Says (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/curved-lines-purchase-intent-31
HTML Embed
<blockquote cite="https://lighthousedata.io/data/curved-lines-purchase-intent-31" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>31%</strong> -- purchase intention lift for brand logos and branding with curved (smile-like) lines<br><small>Source: Science Says (2026) · <a href="https://lighthousedata.io/data/curved-lines-purchase-intent-31" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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