As a newsletter writer on Substack, I've always been frustrated with the built-in analytics.

So I started exporting my CSVs and crunching the numbers with Python scripts. Over time the scripts evolved into something more substantial, and I thought other creators might find it useful too.

I packaged it into a proper desktop app with things Substack doesn't show you:

• > Subscriber engagement scoring

• > Growth source breakdowns

• > Cohort retention

• > Superfan detection

• > 90-day growth forecasting

• > AI-generated strategy from your own data(totally optional)

Everything runs locally on your Mac or Windows PC. Nothing goes to any server.

Launching it today. It's called StackStats:

If you run a Substack, would something like this be useful to you? Would love to hear your thoughts.