Privacy
Last updated 31 August 2026.
The short version
Decadia has no accounts and no analytics. Your streak, your scores and your per-decade stats are stored on your device and are never sent to us. We do not operate a server, and we could not read your results if we wanted to.
The one exception is advertising. If you see an ad, Google receives data in order to serve it. That is the only third party involved, and Decadia Premium removes ads entirely.
What stays on your device
- Your current and longest streak.
- Which days you have completed, and your score on each.
- Your per-decade accuracy, used for “you’re strongest in the 80s”.
All of it lives in the app’s own storage on your iPhone. Deleting the app deletes it. There is no copy anywhere else.
The questions
The whole question bank ships inside the app. Playing the Daily Rewind requires no network connection and sends nothing anywhere. Question updates arrive as an ordinary app update or a file download; neither carries anything about you.
Advertising — the one third party
Decadia shows at most one ad per session, after your results, and never during a round. Ads are served by Google AdMob, which collects data to deliver and measure them. Google’s handling of that data is described in its own privacy policy.
- If you allow tracking when iOS asks, Google may use your device’s advertising identifier to personalise ads.
- If you decline, or ignore the prompt, Decadia requests non-personalised ads instead. Declining costs you nothing: the Daily Rewind is identical either way.
- In regions where consent is required, Google’s consent form appears before any ad is requested.
We require any third party whose code we ship to protect your data to at least the standard described here. Google is the only such third party in Decadia.
Game Center
Leaderboards and achievements are provided by Apple’s Game Center. When you finish a Rewind, Decadia submits your score and streak to Apple. We never read, store or share your Game Center identity — not your player ID, not your alias. Signing in is entirely optional and declining does not limit the game in any way.
Purchases
Decadia Premium is sold through Apple. Payment is handled entirely by Apple and we never see your payment details. The app only learns whether a valid purchase exists.
Children
Decadia is a general-audience trivia game and is not directed at children. We do not knowingly collect information from children.
Your data, and removing it
Because everything the app records stays on your device, there is no account to close and nothing for us to delete. Deleting Decadia removes all of it. To reset advertising personalisation, use Settings › Privacy & Security › Tracking on your iPhone. Game Center data is held by Apple and can be managed through your Apple Account.
Changes
If this policy changes in a way that affects what is collected, the date at the top will change and the app will be updated to link to the revised version.
Contact
Questions about privacy: [email protected]