B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Current
11.4%
11.4% -- reply rate for custom observation image emails (cold outbound) (2026)
Custom observation images (screenshot of website/LinkedIn with annotations) had an 11.4% reply rate in GTMStack tests.
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Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
11.4%
Unit
Percentage
Data Vintage
2026
Entity
Sample Size
1,500
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
GTMStack
Primary
Tier B
https://gtmstack.app/blog/lemlist-multi-channel-campaigns ↗
Source Article
Running Multi-Channel Campaigns with Lemlist Integration | GTMStack
Running Multi-Channel Campaigns with Lemlist Integration
How to set up GTMStack' Lemlist integration for multi-channel campaigns spanning email, LinkedIn, and calls with synced analytics and CRM data.
GTMStack Team
Table of Contents
Why Lemlist + GTMStack Together
Lemlist is one of the strongest out…
Original Research
GTMStack
· Original study ↗
Methodology
GTMStack test across ~1,500 prospects per variant
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
custom observation image emails (cold outbound): 11.4% reply rate. Source: GTMStack (2026). Via Lighthouse Intelligence -- https://lighthousedata.io/data/custom-observation-image-reply-rate-2026
HTML Embed
<blockquote cite="https://lighthousedata.io/data/custom-observation-image-reply-rate-2026" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>11.4%</strong> -- reply rate for custom observation image emails (cold outbound)<br><small>Source: GTMStack (2026) · <a href="https://lighthousedata.io/data/custom-observation-image-reply-rate-2026" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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