Privacy Policy

Updated November 13, 2026

Who is responsible

Erdem Altun publishes Postcard Trails (SolitairePostcard). Contact console.erdemaltun@gmail.com with questions about privacy or to exercise your data rights.

Data stored on your device

The game saves puzzle progress, unlocked postcards, preferences and unsent word reports on your device. Postcard Trails does not require an account or use Firebase to store your game progress. Optional reminders are scheduled on your device. If you buy an item through the App Store, Apple processes the payment; the app receives StoreKit transaction and entitlement information. We do not receive your payment card details.

Optional usage analytics

Analytics is off by default. If you allow it, Firebase Analytics (Google Analytics) receives an app instance identifier, app and device information, approximate location derived from IP, and usage events such as opening the game, starting or completing puzzles, using hints, and unlocking postcards. Gameplay events can include level identifiers, timings, counts and outcomes. With your permission, technical error codes and save-recovery outcomes may also be sent to improve game reliability. We use this data to understand how puzzles are played and improve the game. Analytics events do not include your name, email, payment card details, or the text of a word report. With your analytics permission, Firebase may also automatically measure in-app purchases, including product identifiers, value and currency.

Analysis with BigQuery

With your usage analytics permission, we analyze Firebase event copies in Google BigQuery to understand which levels are lost or completed, hints and retries, shop visits, checkout outcomes, and verified delivery of purchased items. Purchase observations use product identifiers and a hashed transaction reference, without payment card details or purchase receipts. Separate analytical event copies expire after 60 days. In versions that offer rewarded ads, permitted analytics may record earned in-game rewards. Linked Firebase and AdMob reporting may include ad impressions and revenue.

Ads and diagnostics

Versions with rewarded ads let you choose to watch Google AdMob ads in exchange for in-game rewards. Google may process IP-derived approximate location, device identifiers, ad interactions, performance data, and diagnostics to serve and measure ads. Personalized advertising is subject to your regional choices and iOS tracking permission. You can change tracking permission in iOS Settings and review available regional choices in Settings → Privacy & Data → Ad Preferences. Reward and frequency records are stored on your device. See how Google uses information from partner apps.

Service providers and processing

We use Google for analytics, optional rewarded ads, and hosting these pages. Hosting receives ordinary technical request information, such as your IP address, to serve the pages and protect the service. These pages do not run analytics or advertising scripts. Information handled by Google may be processed in the United States or other locations where Google operates. If you email us, we receive your email address and the contents of your message so we can answer and process your request.

Retention and your choices

Device data remains until you remove it or uninstall the app. In Settings → Privacy & Data you can turn usage analytics off at any time. This stops new collection and clears unsent analytics. Google Analytics event and user data retention is set to two months, with no reset on new activity. Aggregate reporting may be retained separately. We keep support correspondence as needed to respond, document requests, or meet legal obligations.

Delete or access your data

See Delete My Data for device erasure and for deletion of analytics already sent. You may also email us to ask for access, correction, or other rights that apply in your location.