Loupe – A iOS app that raises awareness about what native apps can see
Points and comments are a snapshot, not live.
Loupe shows what iOS device fingerprinting data is accessible to any app via public APIs.
Loupe is a free, open-source iOS/iPadOS app that reads real values from public iOS APIs to demonstrate device fingerprinting. Signals are organized into three tiers: Passive (accessible without permission, such as locale and battery), Needs Permission (contacts, photos, location), and Advanced (side-channel techniques like URL-scheme probing and Keychain persistence across reinstalls). Nothing leaves the device unless the user explicitly exports it. The app was written almost entirely by AI coding tools.
What commenters are saying
Commenters focused on specific signals Loupe reveals, especially the volume creation date (last setup/erase time) which strongly fingerprints devices. Several noted that avoiding apps and using the browser is the best defense. One camp argued app store ToS and privacy labels are insufficient; another noted server-side correlation via IP and SDKs bypasses Apple's controls. Some pointed out that Loupe also builds for macOS, though not yet polished. The pasteboard changeCount and installed-apps probing drew particular criticism.