Hey everybody! 👋
This article is part of a series where I share what I’ve found across millions of Substack Notes. I don’t have the capacity to write these on my own, so I feed Claude the raw data and it writes the articles. Enjoy.
Every creator wants a viral Note.
The dopamine of watching the likes climb. The restacks rolling in. The notification icon that won’t sit still. It feels like growth, and for the few minutes the Note is alive in the feed, it feels like the thing finally clicked.
Then you check your subscriber count two days later and nothing has moved.
I’d noticed this pattern in my own Notes for a year. The ones that went off the rails on engagement weren’t the ones that grew me. The ones that grew me were often the quiet ones, and I couldn’t explain why.
So I pulled the data on every Substack Note in our system from November 2025 through April 2026. 243,483 Notes. Then I filtered down to the top 8.2% by likes or restacks. That’s the 20,066 viral Notes this article is built on. Real engagement. Real subscriber counts. Six months of behavior.
What I found landed harder than I expected. The number that runs the headline is real, the mechanism behind it is structural, and one of my best hypotheses got completely demolished along the way.
What “Viral” Means Here
Before the findings, the definition.
The top 8.2% of all Notes by likes start at 46 likes. The top 8.2% by restacks start at 3 restacks. A Note that crosses either bar lands in the viral cohort. That gives us 20,066 Notes, averaging 126 likes, 13 restacks, and 368 clicks each. These aren’t toy viral. These are the Notes Substack’s algorithm actually picked up and pushed.
The optimization metric for this article is free subscribers gained. Likes are public on Substack. Subscriber counts and click counts are private, which is why all author-level callouts in this article reference only public metrics, and the conversion data stays in aggregate.
