Privacy policy

Last updated 18 October 2026 (optional accounts)

SG Mahjong is made by Sing Jie Lee. This policy explains what the app and its game server handle, and why.

No ads, no tracking, accounts optional

You can play without signing up. The app shows no advertising, contains no advertising or analytics SDKs, and does not track you across other apps or websites.

What the game server receives

• The name you type for online tables, shown to the other players at your table.
• A random player ID created on your device, so you can return to your seat after a disconnect.
• Your moves at online tables. A record of each finished hand (the shuffled wall, the moves and the result) is kept for up to 30 days so scoring disputes can be checked, then deleted.
• Your IP address, used only in memory to limit how many avatars can be made per hour, and in standard server logs kept briefly for security.

Games against the computer run entirely on your device. Without an account, your stats stay on your device.

Accounts (optional)

If you sign in to join the leaderboards, we keep your email address (to send you sign-in codes; codes are sent through Resend), your name and avatar (shown on the leaderboards), your rating, weekly points and ranked results, and your game stats. We never show your email to other players or send you marketing. You can delete your account at any time in the app (Profile, Delete account); this deletes everything kept for it.

Avatars (optional)

If you make an avatar, the photo you take or choose is sent to our server and passed to an image service (fal.ai) to draw a cartoon version, and may be checked by an AI service (Anthropic) to make sure it shows one person and is appropriate. We do not store your photo. The cartoon avatars are stored on DigitalOcean Spaces at unlisted web addresses and shown to the players at your tables. Email us to have your avatars deleted.

Children

The app is not directed at children under 13 and does not knowingly collect their personal information.

Points

Scores in SG Mahjong are points only. Nothing of value can be bought, won, transferred or cashed out.

Contact

Questions or deletion requests: [email protected].