Letterdrop lets solopreneur Substack writers auto-swap subscriber lists with complementary newsletters in productivity, personal finance, and indie hacking.
The mechanism
Link your Substack in seconds. We read your subscriber count — nothing else.
Our algorithm pairs you with newsletters in adjacent niches — same audience, zero overlap.
We handle the cross-promotion automatically. Both newsletters grow. No awkward DMs needed.
“The best newsletters grow by helping each other”
The principle behind every great newsletter swap
Early access
Be first in line. We’re onboarding writers niche by niche.