Penflock matches indie newsletter writers for automated audience swaps — reach new readers who already love your niche, no cold pitching required.
Free to join · For newsletters under 50k subscribers
Compatibility score: 94%
How it works
Link your newsletter in 30 seconds. We pull your audience data to build your compatibility profile — no CSV exports needed.
Our algorithm scores compatibility based on topic overlap, audience size similarity, and engagement patterns from real Substack data.
Approve a match, pick a date, and Penflock handles the rest — coordinating shoutouts, tracking results, and measuring subscriber lift.
Why Penflock
Every match is scored for audience overlap, topic alignment, and engagement quality. Stop guessing, start growing with data.
Set your preferences once. Penflock schedules, coordinates, and tracks swaps — you just approve matches and watch subscribers arrive.
Ditch the awkward DMs and spreadsheets. Every partner has already opted in. No rejection, no chasing — just mutual growth.
Be first to grow when we launch. Free tier available forever.