Chrono Glass: Privacy Policy
Last updated: 24 October 2026
Chrono Glass ("the game") is made by Bui Dinh Dan ("we", "us"). This policy explains what information the game uses, why, and the choices you have. It covers the iOS and Android apps.
Summary
- No accounts and no sign-in. We never ask for your name, email, contacts, photos or precise location.
- Your progress is saved on your device.
- The game shows optional rewarded ads (to double the shards you recovered, or to skip a sequence after several failed attempts) and an occasional full-screen ad between sequences through Google AdMob.
- The game can send local reminder notifications, only if you agree.
- The game contains no analytics SDK of its own.
- We do not sell your information.
Data Collection & Analytics
Stored on your device
Your progress (cleared sequences, diamonds, best times and scores, shards, failed attempts) and settings are stored only on your device. They are never sent to us. Deleting the game deletes them.
Advertising
The game shows optional rewarded ads ("x2 SHARDS" after a clear, "SKIP SEQUENCE" after five failed attempts at one sequence) and an occasional full-screen ad when you leave the results screen (never in the first sequences, at most every three sequences and three minutes, never right after a rewarded ad). To show and measure ads, Google may collect device and advertising identifiers, approximate location derived from your IP address, ad interactions and diagnostic data. Ads are never required to play.
Notifications
If you say yes when the game offers reminders, it schedules local notifications on your device (a sequence you were stuck on, the next sequence waiting, a reminder after a few days away). They are created on the device; no notification service or server is involved, and no data leaves your device for them. You can turn them off in your device's notification settings.
Analytics
The game does not use Google Analytics, Firebase Analytics or any other analytics SDK.
Third-Party SDK Disclosures
| Service | What it receives | Why | Policy |
|---|---|---|---|
| Google AdMob | Device and advertising identifiers (IDFA on iOS only if you allow tracking), IP address (used to estimate your region), device and app information, ad interactions and diagnostics. | To show and measure ads and prevent fraud. | Privacy policy |
Your choices: in the EEA, UK and Switzerland the game asks for your consent through Google's consent form before any ad loads, and you can change it any time in Settings → Privacy Options. On iOS the game asks for permission before using your advertising identifier (App Tracking Transparency); you can change this in iOS Settings → Privacy & Security → Tracking. On Android you can reset or delete your advertising ID in your device settings.
Children's Privacy (COPPA)
The game is not directed at children under 13, and we do not knowingly collect personal information from children under 13, in line with the U.S. Children's Online Privacy Protection Act (COPPA) and similar laws. Ads are configured as not child-directed and limited to content suitable for teens. If you are a parent or guardian and believe your child has provided personal information through the game, email [email protected] and we will delete it.
Account & Data Deletion
The game has no accounts, so there is no account to delete. To delete your data:
- On your device: uninstall the app. This removes everything the game stored.
- Advertising data: data collected by Google AdMob is controlled by Google. You can reset your advertising ID in your device settings or manage it at https://myadcenter.google.com.
Security
Information sent by the game travels over encrypted connections (HTTPS/TLS).
Changes
If this policy changes, we will update this page and the date at the top.
Contact
Bui Dinh Dan
Email: [email protected]