Privacy Policy

Last updated: July 10, 2026

This policy explains what LeagueSeer collects, why, and what we don't do with it. The short version: we collect what's needed to analyze your leagues and run your account, we don't sell any of it, and credentials are encrypted.

What we collect

• Account info: your email and login, managed by our authentication provider (Clerk).
• League data: rosters, drafts, matchups, transactions, and manager display names from leagues you connect via Sleeper, ESPN, or Yahoo. Much of this is data those platforms make available about the whole league, so it includes your leaguemates' public fantasy activity.
• Platform credentials: if you link a private ESPN league we store the two ESPN cookies you paste; if you connect Yahoo we store OAuth tokens. Both are encrypted at rest (AES-256), used only to read your league data, and deletable by you on the Accounts page. We never see or store your ESPN or Yahoo passwords.
• Payment data: handled entirely by Stripe. We never see your card number; we store only what you bought and when.
• Support messages: what you send through the support form, so we can reply.

How we use it

To run the product: computing scouting profiles and predictions, generating AI reports, rendering your leagues, fulfilling purchases, and answering support requests. Computed stats (never your credentials) are sent to AI providers to write scouting narratives and answer league chat questions; those providers process the text to generate a response.

What we don't do

• We don't sell your data. To anyone.
• We don't run third-party advertising or ad trackers.
• We don't write to your fantasy platforms, all access is read-only. We couldn't set your lineup if we wanted to.

Sharing

We use a small set of processors to run the Service: hosting (Vercel), database (Supabase), authentication (Clerk), payments (Stripe), email (Resend), and AI inference providers. Each receives only what it needs for its job. We'd disclose data if legally required, that's never happened.

Retention & deletion

League data stays while your account is active so history-based features keep working. Unlinking a league hides it from your account; deleting your account (contact support@leagueseer.com) removes your account data, saved credentials, and support history. You can wipe stored ESPN/Yahoo credentials yourself anytime on the Accounts page.

Cookies

We use cookies for sign-in sessions and security (and a referral cookie if you arrived via an invite link), not for ad tracking.

Children

The Service isn't directed at children under 13, and we don't knowingly collect their data.

Changes

If this policy changes materially, we'll say so on the site before the change takes effect.

Contact

Privacy questions: support@leagueseer.com. See also our Terms of Service.