Grow your audience
without paying for ads.
LettrBond automatically matches you with complementary Substack writers for cross-promotion swaps — powered by real audience similarity scores, not guesswork.
Three steps to your next 1,000 subscribers
Join
Connect your Substack. We analyze your content, niche, and audience demographics — no spreadsheets, no forms.
Get Matched
Our algorithm compares 40+ audience signals to surface writers whose readers would love your newsletter — and vice versa.
Auto-Promote
LettrBond coordinates the swap. Both newsletters cross-recommend on the agreed date. Real readers. Real growth.
“I grew from 800 to 2,400 subscribers in 6 weeks — three swaps, zero ad spend.”
— Beta writer, tech newsletter · 2,400 subscribers
One plan. Unlimited swaps.
Lock in founding-member pricing before we raise it.
- ✓ Unlimited match requests
- ✓ Audience similarity scoring
- ✓ Automated swap coordination
- ✓ Swap performance analytics
- ✓ Priority matching queue
- ✓ Founding member badge
Cancel anytime. No long-term contract.
Price increases to $49/mo after early access closes.
Your next 1,000 subscribers are already reading someone else's newsletter.
LettrBond finds them and builds the bridge.
Get Early Access — $29/mo