Substack Friend Finder

Find people with similar interests based on your Substack newsletter subscriptions.

HOW IT WORKS
1. Enter your Substack username
2. The extension scans your subscribed newsletters
3. For each newsletter, it finds other subscribers and followers
4. People who appear in multiple of your niche newsletters are surfaced as matches
5. Matches are ranked by a "nicheness" score - shared small newsletters count more than big ones

FEATURES
• Scans ALL your subscribed newsletters
• Finds subscribers AND followers of each newsletter
• Nicheness-weighted scoring (niche newsletters count more)
• Export all matches to CSV for further analysis
• Progress saves automatically - close and reopen anytime
• 100% private - all data stays in your browser

PRIVACY
• No data is ever sent to external servers
• No analytics or tracking
• All data stored locally in your browser
• Open source: https://github.com/vanshkumar/substack-friend-finder

TIPS
• Keep the Substack tab open while scanning
• Scanning takes 8-15 seconds per newsletter (to avoid rate limits)
• Results are cached - rescan anytime to refresh