Marble Grandstand privacy policy

Marble Grandstand is a marble racing game for the Mac. This policy describes exactly what it does with data.

Effective date 15 October 2026

On your Mac

Marble names, saved rosters, race results, records and settings are stored in the app's own folder on your Mac. Deleting the app deletes them.
When you choose Save picture on a results screen, the picture is saved to Pictures, Marble Grandstand.
A roster CSV file is read or written only when you pick it in the system file dialog.
Viewers you block are remembered on your Mac, by Twitch user ID and display name, until you unblock them.

Connecting Twitch signs you in on twitch.tv. The game receives an access token for your account and keeps it in your Mac's Keychain; Sign out in the Twitch chat panel deletes it.
While connected, the game reads the chat of your own channel to add viewers who type !join or !play. It never posts in chat.
Viewers' display names become marble names on your Mac. Nothing from Twitch is sent to Lanternbench.
If you choose Report on a viewer, the game opens an email to Lanternbench with that viewer's Twitch user ID and display name. Nothing is sent unless you send that email.
Your Twitch account is covered by Twitch's privacy notice.

It contains no analytics, telemetry, advertising or tracking.
It has no Lanternbench account and sends nothing to Lanternbench.
It connects to the internet only to reach Twitch, and only after you connect it.
It does not sell, share or transfer any data.

If a future version changes how data is handled, this policy will be updated before that version is published, and the effective date will change.

Questions about this policy: hello@lanternbench.com.