Privacy Policy

Last updated November 2, 2026

Ball Knowledge is built to collect as little as possible. You can use the free app without an account. There are no passwords.

What stays on your device

The wallets you follow, your alerts, your promo progress, news filters, and settings are saved in your browser on your own device. We don't see them unless you turn on lock-screen alerts (below).

When you first open Ball Knowledge we ask for your date of birth to confirm you're 18 or older. Only the result ("18 or older") is saved, on your device. We don't keep or send your birthday.

What we store on our servers

Your account (optional, required for Premium): when you sign in with Google or an email link, we receive your email address and a user ID from Google Firebase, which handles sign-in for us. We store your email, your Stripe customer ID, and the settings you choose to sync: the wallets you follow, your alert size, your starred teams, and your promo progress. Firebase processes sign-ins under Google's Firebase privacy terms.
Lock-screen alerts (Premium): if you turn them on, we store your device's push notification address, the wallet addresses you follow, and your alert size, so we can send you alerts. Turning notifications off deletes this.
Premium: we store a random device ID linked to your Stripe customer ID, so Premium works on your devices.

Payments

Payments are handled by Stripe. Stripe collects your email, card, and billing details under Stripe's Privacy Policy. We never see or store your full card number.

Third-party data and services

Ball Knowledge shows public data from Polymarket and news from Bing News, and runs on Cloudflare. Requests to these services go through our servers, so they don't see your IP address directly. Links to sportsbooks, prediction markets, and sponsors take you to their sites, where their own privacy policies apply.

What we don't do

We don't sell your data, use tracking cookies, or use third-party advertising trackers.

Your choices

You can clear everything stored on your device by clearing this site's data in your browser. Signing out stops syncing from that device. To delete your account and everything we store about you, email us and we'll delete it.

Contact

Email ADD YOUR CONTACT EMAIL.