Free preview, no signup
Enter any Substack publication URL. We fetch its public RSS feed server-side and compute cadence, gaps, weekday rhythm, and post length from it.
Want retention by topic?
That needs your subscriber export. Leave your email and we will tell you when it is ready.
What's free right now
- Cadence analyzer (this page): Posts per week, median and longest gap between posts, weekday distribution, median post length, and the recent posts list. All computed from the publication's public RSS feed. No auth, no subscriber data.
- Retention by topic (waitlist): Needs your subscriber export, which Substack does not expose publicly. We'll email the waitlist if and when we build it.