B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Dated
50%
50% -- mobile share of email opens for email opens (2013)
By 2013, more than 50% of emails were being opened on mobile devices according to Litmus data.
- Lower bound stated as 'more than 50%'
Attribution:
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
50%
Unit
Percentage
Data Vintage
2013
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.
Score breakdown
Extraction
75
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
Sources (4)
Litmus
Primary
Tier B
https://www.clarigital.com/codex/history/history-of-email-marketing/ ↗
Source Article
History of Email Marketing: From Spam to | Digital Codex
What You Will Learn
- The invention of email and its earliest commercial use
- The first commercial email spam and how mass unsolicited email became an industry
- The spam crisis of the late 1990s and early 2000s — when spam threatened to make email unusable
- CAN-SPAM (2003) — the US legislation th…
Also cited by
2026-09-30
256content (AWeber)
https://www.256content.com/academy/liz-willits
2026-09-19
Original Research
Litmus
· Original study ↗
Methodology
Attributed in article to Litmus data from that period; 'more than 50%' is a lower-bound figure. Marks the shift to mobile-first email design following the 2007 iPhone launch.
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
email opens: 50% mobile share of email opens. Source: Litmus (2013). Via Lighthouse Intelligence -- https://lighthousedata.io/data/mobile-email-opens-majority-2013
HTML Embed
<blockquote cite="https://lighthousedata.io/data/mobile-email-opens-majority-2013" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>50%</strong> -- mobile share of email opens for email opens<br><small>Source: Litmus (2013) · <a href="https://lighthousedata.io/data/mobile-email-opens-majority-2013" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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