Data Not Collected. No account, no ads, no third-party SDK, no analytics upload,
no tracking, no IDFA, no cookies, no fingerprinting.
The app makes zero network requests and bundles all content (50 procedural 3D
mechanisms + explanatory text) for fully offline use.
The app requests no system permissions — no location, camera, microphone,
photos, contacts, health or motion data.
One interaction event (part_tap: model id, part id, dwell time, timestamp) is written
only to the app's own sandbox (Documents/analytics/). Nothing is transmitted; it never
leaves the device unless you personally export it from the hidden developer panel. Deleting the app
deletes it.
No in-app purchases — all content is free; there is nothing to restore.
Your App Store transaction is handled by Apple under Apple's privacy policy.
Textures derive from CC0 material libraries (ambientCG / PolyHaven); the Chinese font is
LXGW WenKai under SIL OFL 1.1. 3D geometry is generated in-app. None of it contains personal data.