PRACTICE BETA · UPDATED SEPTEMBER 8, 2026

Your practice. Your history.

Dayrival is operated by Bill Riesner. For help, privacy requests or account deletion, contact billriesner@gmail.com from your account email.

What we collect

Signing in provides an account identifier, verified email address and display name. We store your first visit, most recent activity, selected stock tickers, submission times, rules and roster versions, and simulated results. Your confirmation that you are at least 18 and accept the practice rules is recorded with each lineup's rules version.

We do not ask for your date of birth, payment details, brokerage holdings or wallet. The app has no advertising analytics or mailing list. A practice account does not subscribe you to marketing emails.

Why we use it

Your account connects your practice history across devices. We use account and activity information to provide sign-in, save and score lineups, enforce practice limits, resolve support requests and understand beta participation. Dayrival's operator can view player email addresses, display names, signup dates, recent activity and saved lineup counts in a private player overview. Other players cannot access that overview or your saved history.

Sign-in and browser storage

Supabase manages authentication. Available sign-in methods appear on the login screen. Google sign-in shares the basic identity information you authorize; Dayrival does not request access to your email messages or files. Email sign-in uses a one-time code. We do not store a Dayrival password.

Necessary browser storage keeps your sign-in session and renews it while you use the app. Sign out on shared devices. Clearing browser storage signs you out but does not delete your account or saved lineups.

Retention and deletion

We retain account profiles and saved practice history until you request deletion or the operator removes them. The app stores up to 100 saved lineups per account. Use “Delete history” in the app to remove all of your saved lineups from the active database. This leaves your sign-in account and player profile intact.

Contact the operator from your account email to request access, correction or full account deletion. We may need to verify the request before changing records. Deleted information may remain in service-provider backups until those backups expire, or where retention is required by applicable law.

Old guest history

The earlier private preview used a random browser cookie rather than accounts. That history is kept separate and is not automatically attached to a new account. Its cookie can last up to 180 days; losing or clearing it can prevent us from connecting you to those records. Use the control below in the original browser and website address before clearing the cookie.

Service providers and security

OpenAI Sites and Cloudflare host the app and its practice database. Supabase processes sign-in information; the configured email provider delivers sign-in codes. These providers may process IP addresses, browser details and infrastructure logs to deliver and protect the service, including processing in the United States. Infrastructure logs and backups are separate from the app's history control.

We do not sell personal information or use it for behavioral advertising. Access controls protect account history, but no online system can guarantee absolute security. Material changes to this notice will be reflected in its update date and communicated where required.