Grow your newsletter
without buying ads
A Co matches you with complementary newsletter creators for smart cross-promotions. You recommend them, they recommend you — and you both grow with subscribers who actually care.
Three steps to organic growth
Sign up & share your newsletter
Tell us about your newsletter — your niche, audience size, and what kind of creators you want to partner with.
Get matched with the right partners
Our algorithm finds newsletters with complementary audiences — readers who'd genuinely love what you write.
Swap promotions & grow together
Feature each other in your newsletters. You both gain subscribers who are already primed to engage.
Why creators choose A Co
No ad spend required
Stop burning budget on paid acquisition. Cross-promotion is free — you trade recommendations, not dollars.
Higher-quality subscribers
Readers who come through a trusted recommendation are 3× more likely to stay engaged and open your emails.
Smart audience matching
We don't just match randomly. Our algorithm analyzes audience overlap to find partners whose readers will love your content.
Fair and balanced swaps
Our system ensures equitable exchanges based on subscriber counts and engagement rates. No one gets shortchanged.
Track every result
See exactly how many subscribers each promotion brings in. Full transparency on what's working.
Community of creators
Join a network of newsletter writers who help each other grow. Collaboration beats competition.
Join the waitlist
Be among the first newsletter creators to access smart cross-promotion.