B Evidence Grade B Graded accuracy verified by the review judge Safe to Cite Dated

25%

25% -- open rate lift for plain text emails vs HTML emails (2021)

2021  · HubSpot

Plain text emails had a 25% higher open rate than HTML emails according to HubSpot studies.

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Attribution: HubSpot View source
Lighthouse Research Team
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Source verified Evidence graded
Value
25%
Unit
Percentage
Data Vintage
2021
Entity
plain text emails vs HTML emails
Geography
Global
B
Strong, reliable evidence

Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.

60/100 confidence

Single source - not yet corroborated

Extraction
50
Source Trust
60
Citation Chain
20
Independence
30
Methodology
45
Freshness
95
HubSpot Primary Tier C
https://blog.emailoctopus.com/5-food-bloggers-smashing-it-with-their-welcome-emails/ ↗
Confidence: 48/100 Vintage: 2021 Channel: Wayback
Source Article
5 food bloggers smashing it with their welcome emails | EmailOctopus
You’ve got your food blog filled with delicious recipes. And you’ve been busy building your mailing list, successfully converting your website visitors into subscribers. Now it’s time to start developing your relationship with your new subscribers the second they sign up – when they’re most engaged …
Original Research
HubSpot · Original study ↗

Cited from HubSpot studies

Methodology documented
IndustryMedia RegionGlobal RoleAll marketers Channelemail
Plain Text
plain text emails vs HTML emails: 25% open rate lift. Source: HubSpot (2021). Via Lighthouse Intelligence -- https://lighthousedata.io/data/plain-text-email-open-rate-lift
HTML Embed
<blockquote cite="https://lighthousedata.io/data/plain-text-email-open-rate-lift" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>25%</strong> -- open rate lift for plain text emails vs HTML emails<br><small>Source: HubSpot (2021) · <a href="https://lighthousedata.io/data/plain-text-email-open-rate-lift" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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