Substack Explorer

Substack Explorer, by Build to Launch, is for writers who want to know who else writes in their niche and how big they are. Search newsletters by keyword and see the subscriber count and engagement of each one. Benchmark your newsletter against the top ones in your space and track how they grow. Topic pages group newsletters by subject, from engineering to cooking. Developers get API documentation for the Substack endpoints the app uses, and the same data works inside Claude through MCP. Jenny built it to find newsletters in specific niches for her own research, then used it to study 3,000 articles by top AI writers.