A Co is a cross-promotion marketplace that matches newsletter creators for mutual growth. No ads, no fees on free plans — just authentic audience sharing.
Free to start. No credit card required.
How It Works
Tell us about your newsletter — niche, audience size, and the types of creators you want to partner with.
Our algorithm pairs you with newsletters that share your audience profile but aren't direct competitors.
Feature each other in your newsletters. Track new subscribers and watch your audience grow together.
Social Proof
Join 50+ newsletter creators on the waitlist
A Co helped me find 3 perfect cross-promotion partners in my first week. My subscriber count jumped 12% in a single month.
Sarah Chen
The Daily Digest · 5K subscribers
I was skeptical about cross-promotion, but A Co matched me with newsletters that genuinely complement mine. The trust scores are a game-changer.
Marcus Rivera
Tech Insider Weekly · 12K subscribers
As a niche creator, finding the right partners was impossible before A Co. Now I get quality matches that actually convert.
Emily Woodward
The Sustainable Living Letter · 8K subscribers
Pricing
Start free and upgrade as you grow. No hidden fees.
Free
Perfect for trying cross-promotion
Pro
For creators serious about growth
Agency
Manage multiple newsletters
Join hundreds of creators on the waitlist. Be the first to get access when we launch.