For Substack writers in indie hacking & startup advice
Grow Your Substack
Through Smart
Cross-Promotions
WriterEx matches you with relevant newsletters, ranks partners by real engagement, and A/B tests your promo placements — so every swap has a better shot at converting.
Most newsletter cross-promotions still happen through cold DMs, spreadsheets, and gut feel. Writers spend time chasing partners without knowing which swaps will actually bring in engaged subscribers.
The process
How it works
Connect Your Substack
Submit your newsletter and a few details about your audience. We review your engagement profile and niche fit.
Get Matched
WriterEx surfaces relevant swap partners ranked by engagement quality — not just follower count. No more cold DM roulette.
Swap & Track
Launch cross-promotions with built-in A/B testing. See which partners and placements actually drive subscriber growth.
What you get
Built for writers who take
growth seriously
Smart matching
Matched by engagement, not ego metrics
Stop chasing newsletters with big numbers and tiny open rates. WriterEx ranks potential swap partners by audience relevance and real engagement quality.
A/B Testing
Built-in testing for every swap
Test subject lines, blurb copy, and placement positions without setting up another tool. Let the data tell you which combinations convert best.
Automation
Automated swaps, less overhead
WriterEx simplifies partner coordination so cross-promotion becomes repeatable, not a one-off scramble. Spend time writing, not managing deals.
200+
writers already on the waitlist
“Founding writer testimonial coming soon.”
Founding writer
Indie hacking newsletter · Early cohort
Early access
Join the founding cohort.
We’re opening WriterEx to a small group of writers first. Get matched early, shape the product, and lock in founding-member pricing before we launch publicly.
Founding member offer
$49 lifetime access
Pay once on Stripe for lifetime founding-member access, or join the waitlist if you want us to review your newsletter first.
Get early access now
Checkout is live for the $49 lifetime founding-member offer. Prefer to talk first? Join the waitlist below and we’ll review your Substack.