B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
39%
39% -- companies using subject line ab testing for email marketing companies (2026)
39% of companies practice A/B testing on email subject lines.
- Secondary citation from LLCBuddy's 2026 A/B Testing Statistics.
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
39%
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
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Source
LLCBuddy
Primary
Tier C
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Original Research
LLCBuddy
· Original study ↗
Methodology
Cited from LLCBuddy 2026 A/B Testing Statistics; low-authority secondary source
Methodology documented
Segmentation
Industryemail
RoleContent Marketer
Channelemail
Cite this stat
Plain Text
email marketing companies: 39% companies using subject line ab testing. Source: LLCBuddy (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/ab-testing-subject-lines-adoption-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/ab-testing-subject-lines-adoption-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>39%</strong> -- companies using subject line ab testing for email marketing companies<br><small>Source: LLCBuddy (2026) · <a href="https://lighthousedata.io/data/ab-testing-subject-lines-adoption-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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