Ball Knowledge
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.
Our data promise
We never sell, rent or share your personal information with advertisers, data brokers or anyone else. Your details are used only to run your Ball Knowledge account, by the services that power it (Google Firebase for sign-in, Cloudflare for hosting, Stripe for payments), or when the law requires it. If that ever changes, we'll ask you first.
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 for that check. If you create an account, your date of birth is stored with it as described below.
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.
When you create an account we store your first and last name, email, date of birth and (if you add it) mobile phone number with your account. We use your date of birth to confirm you are 18 or older, and your name and phone only to identify and secure your account. You can change them anytime in Account → Edit details, and delete your account anytime in Account → Delete account, which removes these details from our servers.
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 [email protected].