Skip to content
Zyqion
Letter Vault

Privacy policy

Letter Vault keeps your game progress on your iPhone and sends no personal data anywhere. The only third party involved is Google AdMob, which serves non-personalized ads.

Last updated September 16, 2026

The short version

  • Letter Vault does not collect, store or transmit personal information.
  • There is no account, no sign-in and no server. Everything the app remembers lives on your device.
  • The app shows ads from Google AdMob. Every ad request asks for non-personalized ads, and the app never asks permission to track you.
  • There are no in-app purchases, no leaderboards and no notifications.
  • The app asks for no iOS permissions at all.

Who this policy covers

This policy applies to the Letter Vault app for iPhone, published on the App Store by Zyqion. It is the only place the app’s data practices are described: the app itself opens no web pages and has no in-app policy screen.

Information stored on your device

Letter Vault saves the following on your iPhone so the game works between sessions. None of it leaves the device.

  • Game progress: the current puzzle, completed puzzles and Daily Challenge status.
  • Statistics: games played and completed, streaks, best times per difficulty, hints used and perfect games.
  • Progression: your rank, milestones reached, category collection progress and achievements.
  • Profile: a display name and avatar you choose. The avatar can be an emoji or a photo.
  • Settings: language, theme, sound, music and haptics preferences.

This data is stored with Apple’s SwiftData and UserDefaults inside the app’s private container. Other apps cannot read it, and it is protected by your device passcode.

About the avatar photo

If you pick a photo as your avatar, you choose it through the system photo picker, which runs outside the app and hands over only the image you selected. Letter Vault does not request access to your photo library. The image is reduced in size and saved as a single file in the app’s private container. It is never uploaded.

Advertising

Letter Vault is free and supported by ads from Google AdMob. This is the only third-party service in the app.

  • Non-personalized ads only. Every ad request is flagged for non-personalized ads. Google may still use coarse information such as the device type and general region to serve and measure an ad.
  • No tracking. The app does not show the App Tracking Transparency prompt and does not use the advertising identifier (IDFA). Its privacy manifest declares that it does not track.
  • App Store privacy label: “Data Not Linked to You” for Advertising Data and Device ID, both used for third-party advertising and neither used for tracking.

Where ads appear:

  • A banner at the bottom of the game screen.
  • An interstitial after a completed puzzle, at most once every three puzzles and at least five minutes apart.
  • A rewarded video only when you ask for one, to earn two bonus hints or to continue after game over.

Google’s handling of ad data is described in the Google Privacy Policy. You can limit ad personalization on your device under Settings → Privacy & Security → Apple Advertising, and → Tracking.

What the app does not do

  • No personal information is collected: no name, email, phone number, contacts or location.
  • No account or sign-in exists, so nothing is linked to your identity.
  • No in-app purchases. Nothing is for sale and there is nothing to restore.
  • No online leaderboards, Game Center or social features.
  • No notifications. The app never requests notification permission.
  • No data is uploaded to Zyqion or anyone else.
  • No iOS permission of any kind is requested.

Children

Letter Vault is rated 4+ on the App Store. Because the app collects no personal information from anyone, it collects none from children. Ads are non-personalized for every user.

Your choices

  • Reset statistics: Settings → Reset statistics clears your game data after a confirmation.
  • Delete everything: deleting the app from your iPhone removes all of its data, since none is stored elsewhere.
  • Ads: use the iOS advertising settings described above.

Data retention

Data stays on your device for as long as the app is installed, or until you reset statistics. Zyqion holds no copy.

Changes to this policy

If the app’s data practices change, this page is updated in the same release and the date at the top changes. Continued use of the app after an update means you accept the revised policy.

Contact

Zyqion publishes Letter Vault. For any privacy question, email info@zyqion.com.

Questions about this policy: info@zyqion.com