Privacy Policy

This policy explains what Substack Finder (operated by Stack Tools) collects and how we use it. We aim to collect as little as possible.

What we collect

• Account info: your email address (and a password, which is stored securely and hashed by our authentication provider).
• Matches you run: the Substack link you paste in, so we can generate matches and show your history to you and the site owner.
• Payment info: handled entirely by Stripe. We never see or store your card details.
• Basic analytics: privacy-friendly page-view counts to understand usage.

How we use it

To provide and improve the Service, run your account and membership, and send you service-related emails (and, if you opt in, your saved-match digests).

Who we share it with

We do not sell your data. We rely on a few trusted service providers who process data only to run the Service:

• Supabase — database & login
• Stripe — payments
• Vercel — hosting & analytics
• Anthropic — the AI that generates matches. The Substack you paste in is sent to the AI (which may perform a web search) to produce your matches.
• Resend — email delivery

Retention & deletion

We keep your data while your account is active. Email us anytime to access or delete your data.

Cookies

We use a minimal login/session cookie to keep you signed in. We don’t use advertising cookies.

Contact

Questions or requests? Email stacktoolsinbox@gmail.com.