Grow your newsletter by swapping audiences with complementary creators
Penplex matches indie hackers and solopreneurs writing Substack newsletters — so you can cross-promote to exactly the right audience. No cold DMs, no guesswork.
Indie Hacking
2.4k subs
Solopreneur tips
3.1k subs
How it works
Three steps to your next 1,000 subscribers
Who it's for
Built for the builders who write
Indie Hackers
Building in public? Turn your product journey into a subscriber-growth engine.
Solopreneurs
One-person businesses running on trust. Cross-promote to audiences that already get you.
Makers & Builders
Shipping side projects? Find writers in adjacent spaces — dev tools, no-code, design.
Bootstrappers
No VC budget? Subscriber swaps are the highest-ROI growth lever for self-funded founders.
Creator-Founders
Your newsletter is your moat. Grow it with peers who share your values, not competitors.
Anyone on Substack
Under 500 subscribers or over 50k — swaps work at every stage if the audiences align.
Early feedback
★★★★★
“I did my first swap through Penplex and gained 340 subscribers in a week. More than I got in the previous three months combined.”
Sarah K.
@sarahbuilds · 4.2k subscribers
★★★★★
“Finding complementary newsletters used to mean cold DMing strangers on Twitter. Penplex turns that into a proper matchmaking system.”
Arjun M.
@arjunships · 1.8k subscribers
★★★★★
“The matching is surprisingly good. My first match was a developer tools newsletter whose readers were exactly who I wanted to reach.”
Kim L.
@kimcreates · 8.1k subscribers
Pricing
Free to start. Upgrade for unlimited swaps.
No credit card required. Start swapping for free and scale when you're ready.
Free
- ✓ 2 swaps per month
- ✓ Basic matching
- ✓ Public profile listing
- ✓ Swap analytics
- ✓ Email support
Pro
- ✓ Unlimited swaps
- ✓ Priority matching
- ✓ Advanced analytics
- ✓ Scheduling tools
- ✓ Priority support
- ✓ Early access to new features