Terms

StackSignal by Compound 30™ · not affiliated with Substack · Last updated 1 October 2026

The short version

StackSignal by Compound 30™ is an independent analytics dashboard for Substack and LinkedIn writers. It is not affiliated with, endorsed by or connected to Substack Inc. or LinkedIn.

Who can use it

StackSignal is for subscribers of the Compound 30 Substack. When you sign up, you agree to be subscribed to it (free tier) if you aren't already. You can unsubscribe from the newsletter on Substack at any time; StackSignal access is tied to your paid StackSignal plan.

Plans and billing

• $5 a month or $50 a year, billed in US dollars by Stripe. No free trial.
• Plans renew automatically until you cancel.
• Cancel any time from Settings → Account → Manage billing. You keep access until the end of the period you've already paid for.
• Discount codes, where offered, apply as stated on the code.
• If you're ever charged in error, reply to any StackSignal email and we'll put it right.

Your data and the data we show

StackSignal shows publicly available data from Substack and LinkedIn, plus any numbers you choose to enter from your own stats. Only enter data you have the right to use. Competitor data is public counts and public posts only. See the Privacy page for detail.

Fair use

Don't try to break, scrape or overload the service, share your login, or use it to harass anyone. We may suspend accounts that do.

No guarantees

Numbers come from public sources and what you enter and may be delayed, incomplete or change without notice. StackSignal is provided as is, without warranties, and our total liability is limited to what you paid us in the previous 12 months, to the extent the law allows.

Changes

We may update these terms. If a change is material, we'll tell you by email before it takes effect.