Newsletter Insights — independent newsletter & sponsorship data across 40K+ newsletters
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by Guillermo Flor
Daily high-signal content on how to build, grow and fund startups in the AI era.
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Tell us your brand and audience. We send back 10-15 newsletters matched to your brief, with sponsor history and CPM ranges per placement.
$300·2-3 working days·refunded if we can't deliver
See what's includedProduct Market Fit's metrics, benchmarks, and sponsor data in one document
79K
Top 10% in Business
substack
Business
~40/post
avg comments + likes (0.05% rate)
Above category average
~4x per week
4.4 posts/week avg
vs 1.0/week category avg
$99.99/mo
Category avg: $5/mo
720
newsletters in Business
Top 10% in Business
out of 720 newslettersPublishing Frequency
~4x per week
Last published Oct 21, 2026
4.4 posts/week avg