Growth you can read
Cumulative growth, monthly signups and the paid share of your list — in one glance.
Local-only · no API access needed
Drop in your Substack and Stripe CSV exports and get subscriber growth, paid vs. free split, revenue trends and issue-level performance — all computed in your own browser.
No account needed — your files never leave your browser.
What you get
Every number a paid newsletter needs
Revenue in context
Monthly revenue trend and average revenue per paid subscriber from your payout exports.
Issue performance
Sortable table of every issue: revenue, new subscribers, and which posts actually converted.
ToS-safe by design
No scraping, no API keys, no account linking. You export the CSV, the browser does the math.
How it works
Three steps, zero integrations
01
Export
Subscribers from Substack, payouts from Stripe — plain CSV.
02
Drop it in
Columns are auto-detected. Files never leave your device.
03
Decide
See what converts, then price and publish with confidence.
Pricing
One payment, yours forever
Lifetime access
$9one-time
- Unlimited history — every month you export
- All four charts plus the issue performance table
- Lifetime access, one-time payment
- Local-only processing, no data ever uploaded
Secure checkout via Stripe.
Your full history, every chart, no limits.
Import your exports and explore every metric — all processed locally in your browser.