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Newsletter Insights — advertising rates and audience data for 21K+ newsletters
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Uses Substack subdomain (erictopol.substack.com). Migrating would require subscribers to re-subscribe at a new address.
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Facts, data and analytics about biomedical matters.
Data updated Yesterday
Better Brain by Dr. Julie
172K subs
-0.3%/wk
Sensible Medicine
106K subs
Dr. Jessica Knurick
69K subs
++0.7%/wk
Avg Comments
6.0
Avg Likes
294.0
Engagement Rate
0.15%
Beyond the Noise
33K subscribers
(comments + likes) / subscribers
Typical for lists with 203K+ subscribers
Quality Score
Engagement vs Health
0.15% engagement rate
See Ground Truths's score breakdown & category ranking
Quality sub-scores, category percentile, and engagement benchmarks
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12.1K paid
Weekly Growth
+0.3%
Paid Subscriber Retention
Insufficient data
24 of 30 days needed
Paid newsletter — revenue data available
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MRR methodology, pricing analysis, and revenue projections
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$17–$38
See detailed CPM analysis
Category benchmarks and audience-size adjusted rates
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Sign up freePublishing Frequency
Weekly
Last published Mar 6, 2026
1.0 posts/week avg
Health Pricing
$15.62/mo avg
Below average(-49%)
Monetization Readiness
Already monetizing
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