Privacy

Short version

Gurn reads your facial expressions to control the game. That tracking happens entirely on your device — Gurn never stores or transmits any face or depth data. When you record a run, the resulting clip is an ordinary video saved on your phone; it leaves the device only if you choose to share it. We don't sell your data or use it to target ads. What little Gurn does send off-device — friend-challenge data you explicitly create or play, opt-in anonymous gameplay stats, always-on anonymous crash and error diagnostics, and a count of how often our own in-game billboards appeared — is described below.

Face tracking

Gurn uses Apple's ARKit face tracking (the TrueDepth camera) to read facial expressions and head pose in real time. This is the same on-device technology behind Face ID and Animoji. The raw face geometry, depth map, and expression values are processed live on your device to move the runner and are never written to disk, never saved, and never sent anywhere. Gurn requires camera permission for this; the camera is used only while you're actively playing.

Recordings

When you record a run, Gurn captures a normal video — the gameplay alongside the front-camera view of your face — and stores it locally on your device. Gurn never uploads your recordings. Sharing a clip (to TikTok, Messages, your camera roll, etc.) is always an action you take, through the standard iOS share sheet. Once you hand a clip to another app or service, that destination's own policies apply.

What we collect

• Game Center identity (if you opt in). If you sign in to Game Center, Apple manages your leaderboard and achievement data under your Apple ID. Gurn submits your scores to the boards you play; it does not see your Apple account details.
• App Store purchase receipts. When you make an in-app purchase, Apple sends a cryptographically signed receipt that Gurn verifies to unlock the item. We never see your payment details.
• Friend challenges. When you choose "Challenge a Friend," Gurn sends the challenge code, deterministic course settings, exact score to beat, and a separate random player id to our server. When someone plays that link, Gurn sends their exact result so the sender can see how many people tried and whether anyone won. This is the core social feature you explicitly use, not analytics; it works whether or not you opt into anonymous gameplay analytics. The challenge id is random, is not your Apple ID or advertising identifier, and is deliberately separate from the analytics id below.
• Anonymous gameplay analytics (opt-in). If you turn on "Share anonymous stats" (Settings), Gurn sends bucketed, anonymous events about how the game is played — which mode, roughly how far you got, whether a clip was exported or shared, basic performance and tracking-health — to our own server so we can improve the game. These are grouped into ranges (never exact scores), tied only to a random per-install id (not your Apple ID, not the device advertising identifier), never linked to you, and never sold or used to target ads. You can turn it off anytime in Settings.
• Anonymous crash + error diagnostics (always on). To fix problems we otherwise can't see — an app crash, or a clip that fails to render — Gurn sends a fully anonymous report: what kind of failure it was (a bucketed category, never a file name, path, or personal detail) and which app build it happened on. These carry no identifier at all — not your Apple ID, not either random id described above, nothing — so they can't be tied to you or joined together across reports. Gameplay analytics remain opt-in; challenge traffic happens only when you use the challenge feature.
• House-ad delivery counts. Gurn shows its own promotional billboards as scenery in the game world — never third-party targeted ads, and there is no third-party ad SDK. We keep a simple aggregate tally of how often our own billboards appeared, with no profile of you and nothing shared with anyone.

What we do not collect

• Any face or depth data. It never leaves the on-device tracking pipeline.
• Your recordings or clips. They stay on your device unless you share them.
• Your name, email, contacts, location, or photo library (beyond a clip you explicitly save or share).
• Third-party analytics or ad SDKs. No Mixpanel, Amplitude, Segment, no ad networks — no third-party trackers at all. The only analytics are our own anonymous, opt-in stats described above.

Third-party services

• Apple Game Center & App Store — leaderboards, achievements, and purchase processing, governed by Apple's policies.
• Cloudflare — hosts this website and our game backend (api.gurn.app), which receives friend-challenge records, anonymous opt-in analytics, diagnostics, and aggregate house-ad counts described above — no face data. Standard IP-level request logs are retained briefly for abuse detection per Cloudflare's privacy policy.

Children

Gurn is not directed at children under 13, and we do not knowingly collect data from anyone under 13. Because the game points the front camera at the player, please supervise younger children's use.

Data deletion

Uninstalling Gurn removes local settings, saved clips, cached cosmetics, and the random challenge id from that phone. Shared challenge links and their anonymous result counts may remain so links already sent to friends keep working. Email hi@gurn.app with a challenge code to have that record deleted. Game Center data is managed by Apple; manage or delete it in iOS Settings → Game Center.

Contact

Questions about this policy? Email hi@gurn.app.