Auto-swap subscribers with complementary newsletters matched by engagement rate. Both sides grow. No spam.
How it works
Link your newsletter platform. We pull in your subscriber count, open rates, and niche tags — nothing else.
Supports Substack, Beehiiv, ConvertKit & more
Our engine pairs you with newsletters in complementary niches that have similar engagement quality. No mismatches.
Engagement-weighted algorithm, not just list size
Both newsletters recommend each other to subscribers who opted in. Clean growth, zero ad spend, real readers.
Average 12% subscriber lift per swap
Built for crypto
Whether you cover DeFi alpha, NFT drops, L2 deep dives, or trading signals — LetterDex connects you with writers in adjacent niches. Your readers discover related content they actually care about.
Quality over quantity
Random cross-promos tank your deliverability. LetterDex matches newsletters by engagement quality — open rates, click rates, and niche relevance — so both sides protect their list health.
Swaps are only triggered with newsletters that match your engagement tier. No dead weight.
Subscribers from swaps are pre-qualified by interest. They opted in because they care about your niche.
Our algorithm ensures balanced value in every swap. No one-sided deals. Both newsletters benefit equally.
Pricing
Try the platform. See what a swap looks like.
Unlimited swaps for serious newsletter growth.
White-glove growth with a dedicated swap manager.
Early access
Join the waitlist for early access. We're onboarding crypto newsletter writers now — spots are limited.