Blackjack 21

Privacy Policy

Last updated: October 15, 2026

Blackjack 21 ("the app") is a free, virtual-chip card game. It does not involve real money, real-money gambling, or any way to cash out — the chips have no monetary value and cannot be purchased with or exchanged for real currency. This page explains what data the app collects and how it is used.

Account & sign-in

You can play in two ways:

• Guest play — the app creates an anonymous account for your device via Firebase Authentication. No personal information is collected.
• Google Sign-In (optional) — if you choose to sign in with Google, the app receives your Google account's display name and profile photo. This is used only to show your name/avatar to other players in leaderboards and friend groups.

What we store

The app stores game data in Firebase (Firestore), tied to your account id:

• Your display name and avatar (visible to other players in your friend group and on leaderboards)
• Your chip balance, stats, and leaderboard score
• Friend-group membership (a 6-character code shared with people you invite)

We do not collect your email address, phone number, precise location, or payment information — the app has no in-app purchases or payment features of any kind.

Notifications

If you allow notifications, the app schedules them entirely on your device (a daily chip-bonus reminder and an alert when a friend passes your leaderboard score). These are not sent from a server and no notification content is transmitted off your device.

Usage and crash reports

The app reports anonymous counts of what happens in the game — hands played and their result, daily bonuses claimed, missions and achievements completed, levels reached, which screens are opened — and sends a report when it crashes. This is done through Google Firebase Analytics (Google Analytics for Firebase) and Firebase Crashlytics. Crash reports also include basic device and app information such as the device model, Android version and app version. These reports carry no display name, no group code, no account identifier and nothing you type. You can turn all of it off under Privacy in the app's Settings, after which nothing further is collected.

Advertising

The app does not contain any advertising SDK and does not show real ads. No ad network receives any data about you.

Data sharing

We do not sell your data. Data is shared only with Google (Firebase and Google Analytics), our backend and analytics provider, to operate the app (authentication, database, hosting, usage and crash reports). It is never shared with advertisers or other third parties.

Data deletion

To request deletion of your account and associated data, email us at the address below with your in-app display name or friend-group code so we can locate your record. We will delete it within 30 days.

Children

Blackjack 21 is not directed at children and simulates casino-style betting with virtual chips; it is not intended for users who do not meet the minimum age required by their app store's content rating.

Changes to this policy

If this policy changes, the "Last updated" date above will change and, for material changes, we'll note it in the app's release notes.