Newsletter Platforms
How creators choose their ESP
See which platforms power different topics, where one ESP leads, and where the market is fragmented.
Platforms tracked
Active ESPs indexed
Newsletters with identified platform
With identified platform
Topics with clear platform default
75%+ single-platform share
Topics with mixed platforms
No platform above 60%
Market briefing
Platform trends
Key patterns in how newsletter operators choose infrastructure
Market share
Substack powers 90% of tracked newsletters
The dominant platform by newsletter count across the ecosystem
Infrastructure
4 platforms serve 995 newsletters
The market has clear infrastructure preferences, but alternatives are growing
Concentration
26 topics have a clear platform default
One platform holds 75%+ share in these topics
Market share
Which platforms power the newsletter ecosystem
Platform share across active newsletters indexed by NicheIndex
Based on 995 newsletters indexed in the last 90 days
Topic analysis
Which platforms dominate each topic
Platform mix across newsletter categories, sorted by total newsletters
| Topic | Newsletters | Platform mix |
|---|---|---|
| Health & Wellness | 62 | |
| Food & Drink | 61 | |
| Global Politics | 57 | |
| Culture | 52 | |
| Music | 52 |
21 more topics analyzed
Concentration
Platform defaults vs fragmentation
Does your topic have a clear platform default, or is the market split?
Clear platform default
One platform holds 75%+ of newsletters in these topics
Mixed infrastructure
No single platform holds 60%+ in these topics
No topics with mixed platform usage detected
By platform
Large newsletters by platform
Examples of large newsletters on each platform, ranked by subscriber count
Substack
Letters from an American
U.S. Politics
PolitiBrawl
U.S. Politics
CosmicRx Weekly Energy Report
Faith & Spirituality
2 more platforms
Platform activity
Platform activity feed
Product launches, feature updates, and migration signals across the ESP landscape
Recent product launches, infrastructure updates, and platform activity across the newsletter ecosystem.
Platform activity feed launches soon. No synthetic content is shown.
Topics Intelligence
Unlock full platform intelligence
See complete ESP coverage across every topic, platform defaults, and which creator tools dominate each niche.