Act on insights, not intuition.
Newsletter market intelligence for creators and advertisers. 18,080+ newsletters. 327 segments. Updated daily.
18,080+
Newsletters Indexed
327
Segments Tracked
Daily
Data Refresh
997
Advertisers Detected
Creator Intelligence
See where demand exceeds supply.
$79/yr
Sponsor Intelligence
See where brands are placing — and where they are not.
$799/yr
What the data shows
Live signals from the newsletter market. Not curated lists — indexed intelligence.
AI & Machine Learning has the highest opportunity score of any segment — fast audience growth, low newsletter density.
Travel newsletters average 1.4 brands per newsletter — the highest advertiser concentration in the index.
Technology, Business, and News account for 40% of all tracked sponsor placements.
Most newsletter research is vibes. This is data.
Scroll Substack leaderboards and guess what's working
See every segment ranked by opportunity score — subscriber demand vs. content supply
Ask ChatGPT for newsletter ideas and get hallucinated names
Real newsletters, real subscriber counts, real growth data — updated daily
Cold-email newsletters hoping they accept sponsors
See which newsletters already run sponsors, what brands appear, and how often
A one-time snapshot is a directory. An annual subscription is a market intelligence tool.