Underglass
Privacy policy
Last updated November 2026
What stays on your device
Your tanks, settings and photos or videos you save are stored only on your iPhone or iPad. Underglass has no accounts and does not upload your tanks. If you use iCloud Backup, iOS may include the app data in your own iCloud backup. That is controlled by your Apple account and settings, not by us.
What we collect
Nothing. We do not collect, receive or store any personal information about you. Underglass has no accounts, no advertising, no analytics and no tracking, and it does not use a server. The app works offline.
Coins and iCloud Keychain
Your coin balance and unlocked items are saved in your own iCloud Keychain so they can follow you to a new device. This is handled by Apple on your account and is not sent to us.
Permissions
Underglass does not ask for access to your camera, microphone, location, contacts or photo library. When you save a photo, a video or a tank file, you choose where it goes through the standard iOS share sheet.
Third parties
None. Underglass contains no third-party analytics, advertising or tracking code and shares nothing with anyone. The 3D engine (three.js, open source) is bundled inside the app and runs on your device.
Purchases
Coins are consumable in-app purchases handled by Apple. We do not see your payment details. Purchases are covered by Apple standard terms: Apple standard EULA at apple.com/legal/internet-services/itunes/dev/stdeula.
Children
Because we collect no information at all, we do not collect personal information from anyone, including children.
Deleting your data
Delete a tank in the app at any time. Deleting the app removes everything stored on your device. Coins and unlocks kept in iCloud Keychain are managed in your Apple account.
Changes
If this policy ever changes, the new version will be posted on this page with a new date.
Contact
Questions about privacy: support@sanghuynhxuan.com