Grow your Substack on autopilot —
swap readers with newsletters
your audience already loves
QuillX automatically matches AI productivity writers with complementary newsletters and executes mutual subscriber swaps — no cold DMs, no awkward asks, no manual work.
No spam. Early access guaranteed. Cancel anytime.
Recent successful swaps
Why QuillX
The growth channel
writers have been
asking for
Cross-promotion works — but doing it manually is a full-time job. QuillX makes it effortless and scales with you.
No cold outreach
Forget awkward DMs and unanswered emails. QuillX handles introductions automatically — you show up as a recommended read, not a stranger.
Only complementary niches
Our matching engine pairs you exclusively with non-competing writers. Python automation writers find ChatGPT prompts writers. AI tools reviewers find workflow automation writers.
Fully automated
Set your preferences once. QuillX continuously finds matches, executes the swaps, and tracks growth — all without you lifting a finger.
How it works
Connect your Substack
Link your newsletter in under 60 seconds. We read your niche, your audience size, and your recent content.
We find your matches
Our algorithm surfaces complementary writers who share your audience interests but don't compete with your content.
Readers flow both ways
Mutual recommendations go out automatically. Your audience grows. Theirs too. Everyone wins.
Limited early access
Your next 500 subscribers
are already writing
Join the waitlist today and be among the first writers to activate automated subscriber swaps when QuillX launches.