Privacy Policy

Who we are

Brilliant Mahjong is published by Brilliant Model Tech LLC ("we", "us"). This policy describes how we handle information when you use our mobile app and this website.

Contact: info@thebmtech.com

Summary

• We do not require an account for solo offline play.
• Online 1v1 uses anonymous Firebase Authentication (a random user ID per session).
• We use Google Firebase and Google AdMob as described below.
• We do not sell your personal information.

Information we collect

Data you provide

The app stores game progress, settings, and replay history locally on your device. We do not collect your name, email, or phone number through normal gameplay.

Automatically collected data

Through Google Firebase and related services we may collect:

• Analytics — app events via Firebase Analytics to understand usage and improve the app.
• Crash reports — stack traces via Firebase Crashlytics when the app crashes.
• Performance — timing metrics via Firebase Performance Monitoring.
• Advertising — after your first five wins, an anchored banner ad may appear via Google AdMob.
• App Check — attestation signals so backend requests come from genuine app installs.

Online multiplayer

When you create or join a 1v1 room, we store room state in Firebase Cloud Firestore, including an anonymous user ID.

Shared replays (when available)

If you share a replay link, we store the game data needed to replay that run on our servers. Shared links are unlisted.

Push notifications (optional)

If you allow notifications, we use them for streak reminders. You can disable them in device settings.

How we use information

• Operate and improve the game and online features
• Diagnose crashes and performance issues
• Display non-intrusive advertising as described in the app
• Protect our services from abuse (App Check, rate limits)

Third-party services

We use services operated by third parties, including:

• Google Firebase (Analytics, Crashlytics, Performance, Authentication, Firestore)
• Google AdMob (advertising)
• Expo / EAS (app updates and build infrastructure)
• Vercel (hosting this website and replay pages)

See Google Privacy Policyand Vercel Privacy Policy.

Children

The game is rated for general audiences. We do not knowingly collect personal information from children under 13.

Data retention

Local game data remains on your device until you uninstall the app. Firebase data is retained per Google's settings. Shared replay links remain available until removed or you request deletion when that feature is offered.

Your choices

• Disable personalized ads in device settings
• Turn off push notifications in system settings
• Play offline without online or sharing features
• Uninstall the app to remove local data

International users

Data may be processed in the United States and other countries where our service providers operate.

Changes

We may update this policy on this page and change the "Last updated" date.

Contact

Questions: info@thebmtech.com

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