Newsletter Insights — advertising rates and audience data for 45K+ newsletters
Browse all →Track Sayer Ji's Substack's growth
Get notified when subscribers, engagement, or pricing changes
Platform Portability
Uses Substack subdomain (sayerji.substack.com). Migrating would require subscribers to re-subscribe at a new address.
Custom domains let newsletters switch platforms without losing their audience.
Are you a newsletter creator? Get verified insights →
Investigative journalism on health, science, and power, sourced to the primary record. Founder of GreenMedInfo.com. Deplatformed in 2021; publishing here without intermediaries.
Data updated Today
Avg Comments
30.6
Avg Likes
129.1
Engagement Rate
0.29%· ~160 likes + comments/post
(comments + likes) / subscribers
Quality Score
Engagement vs Health
0.29% engagement rate
Score Breakdown
Engagement Score
vs 135 newsletters in Health
55K places you in the top 10% of newsletters in this category.
Engagement Rate
0.29%
median: 0.00%
Posts per Week
6.8
median: 1.0
Publishing Consistency
83/100
median: 67/100
Subscribers
55K
median: 1K
| Public |
| The Body Doesn't Just Get Sick. It Gets Poisoned.Sayer Ji and Leila on what 100,000 studies reveal about terrain, toxicity, and the body's intelligence.Sep 25, 2026 | Public |
| SHADOW EMPIRE Hit’s a #1 Category on Amazon—Before PublicationSHADOW EMPIRE has reached #1 in Amazon’s Law Witnesses category before its official release.Sep 24, 2026 | Public |
3.7K paid
Weekly Growth
Stable
Paid Subscriber Retention
+1.9%
net growth
Track revenue changes over time
Start tracking — freeTrack CPM rates as they change
Start tracking — freeSubscriber counts are rounded by the platform — step changes may not reflect actual growth
🌻 A Year of Mental Health
58K subs
Friendly Neighbor Epidemiologist
52K subs
Stoicism: Philosophy as a Way of Life
51K subs
Get email alerts when subscribers drop or spike, when new sponsors appear, when pricing changes, or when publishing cadence shifts. Track unlimited newsletters across your watchlist with the Starter plan.
$29/mo·cancel anytime
See what's includedGet the full whitespace list with each brand's category fit, audience overlap, and recommended pitch order. Plus a comparison of Sayer Ji's Substack vs the top 15 peer newsletters on sponsor mix, growth, and CPM.
Including Momentous, Maui Nui Venison, GORUCK + 76 more.
$300·2-3 working days·refunded if we can't deliver
Publishing Frequency
Daily
Last published Sep 30, 2026
6.8 posts/week avg
Health Pricing
$6/mo median
Above average(+67%)
Monetization Readiness
Already monetizing
100% of similar-size Health newsletters also have paid tiers
Unlock revenue estimates, CPM benchmarks, and detected sponsors
Start tracking — free55.0K subscribers and 0.29% engagement — past the threshold where Health newsletters typically attract sponsors.
Premium Pricing
Priced at $10/mo, 67% above the Health median of $6/mo.