B
Evidence Grade B
Graded
under review
Safe to Cite
Current
26%
26% -- subject line a b test open rate difference for Ladders email subject lines (2026)
Attribution:
View source
Lighthouse Research Team
Last verified:
·
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Source verified
Evidence graded
Value
26%
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
95
Source Trust
50
Citation Chain
20
Independence
30
Methodology
45
Freshness
86
Source
Ladders
Primary
Tier A
https://www.ere.net/articles/elon-musk-has-a-secret-and-other-lessons-about-email-subject-lines ↗
Source Article
‘Elon Musk Has a Secret’ and Other Lessons About Email Subject Lines | ERE
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Original Research
Ladders
· Original study ↗
Methodology
A/B testing results from email campaigns
Methodology documented
Segmentation
Channelcommon_crawl
Cite this stat
Plain Text
Ladders email subject lines: 26% subject line a b test open rate difference. Source: Ladders (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/subject-line-a-b-test-3
HTML Embed
<blockquote cite="https://lighthousedata.io/data/subject-line-a-b-test-3" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>26%</strong> -- subject line a b test open rate difference for Ladders email subject lines<br><small>Source: Ladders (2026) · <a href="https://lighthousedata.io/data/subject-line-a-b-test-3" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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