Privacy Policy
Last updated: June 21, 2026
This Privacy Policy explains how Letterain (the "App"), developed by Cloud Design Studio LLC ("we", "us", "our"), handles information when you use the App. We've kept the App's data collection minimal on purpose.
1. Information stored on your device
Letterain stores the following on your device (in UserDefaults) so the game works between sessions:
- Your personal best score, best word, longest word, and total rounds played
- Your settings preferences (sound on/off, haptics on/off)
- Whether you've seen the first-launch tutorial
- Whether you've purchased Letterain Pro
- A counter tracking completed games (used to time interstitial ads)
This data never leaves your device. We do not transmit it to our servers. Deleting the App removes all of it.
2. Friend challenges
When you tap "Challenge" on a game-over screen, the App generates an HMAC-signed URL containing your final score and the round's random seed. You then choose to share it (via iMessage, social media, etc.) through Apple's native share sheet. We do not send the URL to our servers, we do not see who you challenged, and we do not store the URL ourselves.
When a friend taps your shared link on a device with Letterain installed, the App opens locally and plays the same letter rain — no server is involved.
3. Advertising
Free-tier players see an interstitial advertisement after every two completed games. Ads are served by Google AdMob, which is governed by Google's Privacy Policy.
Apple's App Tracking Transparency framework requires us to request your permission before AdMob can use your device's Advertising Identifier (IDFA) for personalized ads. If you decline, you'll still see ads, but they won't be personalized.
Letterain Pro removes all ads and the App will not contact AdMob's servers for ad requests once Pro is unlocked.
4. In-app purchases
The Letterain Pro upgrade is processed by Apple's App Store using StoreKit. Apple handles the payment and provides us only the entitlement (a yes/no flag confirming you bought it). We never see your credit card, billing address, or Apple ID.
Restoring your purchase on a new device queries Apple's servers via the same StoreKit framework.
5. Crash reports and analytics
Letterain does not integrate any third-party analytics SDK (Firebase Analytics, Mixpanel, Amplitude, etc.). We do not track your gameplay sessions, screen views, or feature usage.
If you opt to share anonymous crash diagnostics with Apple in your iOS Settings, Apple may forward those reports to us through App Store Connect. These contain technical stack traces, not personal information.
6. Children
Letterain is suitable for all ages. We do not knowingly collect any personal information from children. If you believe a child has provided personal information to us through any contact, please reach out at the email below and we'll delete it.
7. Your choices
- Opt out of personalized ads — decline the App Tracking Transparency prompt, or change it at any time in iOS Settings → Privacy → Tracking → Letterain.
- Reset all stats — in the App, open Settings → Danger Zone → Reset all stats.
- Delete the App — removes all locally stored data immediately.
8. Changes to this policy
If we materially change how Letterain handles data, we'll update this page and bump the "Last updated" date at the top. Continued use of the App after an update constitutes acceptance of the revised policy.
9. Contact
Questions, comments, or data-deletion requests:
Mailing address:
Cloud Design Studio LLC
West Orange, NJ, USA