Birkhem privacy policy

Last updated 24 October 2026. Applies to the Birkhem app on Google Play and the App Store, and to the browser game at birkhem.ylo.se.

The app

The Birkhem app runs entirely on your device. It does not collect, store or send any personal data. It has no account, no sign-in, no analytics, no advertising and no third-party tracking, and it does not need an internet connection: it works the same in airplane mode.

Your saved game (your characters and their progress) is kept in the app's own storage on the device. It never leaves the device. Deleting the app deletes the save.

The browser game

The online version at birkhem.ylo.se is a multiplayer game, so some data has to reach the server for it to work:

• Your account: a username and a password. The password is stored as a hash, never in clear. No email address or other personal detail is asked for.
• Your characters and everything about them (level, items, quests, position), so they are there when you come back.
• Chat messages, which other players see and which stay in the server's logs for a while so abuse can be dealt with.
• Gameplay recordings: what the server sends to each room (positions, actions, fights) is recorded so bugs and balance can be looked at afterwards. Recordings are kept for up to a year.
• Error reports: if the game breaks in your browser, it sends the error, the game build, the map, your character's name, the last few things that happened and your browser's name and version, so the bug can be fixed.
• Server logs with the usual web request details (your IP address, the time, what was requested), kept for a limited time for security and debugging.

The browser keeps a sign-in token and your settings in its local storage, nothing else. There are no ads, no third-party analytics, and nothing is sold or shared with anyone.

Deleting your data

Ask through the contact address on the store listing, naming your username, and the account and all its data are deleted. In the app, deleting the app is enough.

Children

Birkhem is not directed at children under 13 and asks for no personal information from anyone.

Changes

If this policy changes, the new version is published at this address with a new date.