Apps can track you across other apps through shared advertising and analytics SDKs embedded in different apps. A fitness app, a mobile game, and a shopping app can each quietly report activity to the same ad network or analytics provider behind the scenes, and that network can stitch your behavior into a single profile that follows you from app to app.
How do apps track you across different apps?
Most apps aren't built entirely from scratch. Developers drop in third-party SDKs for analytics, crash reporting, and advertising. When one of those SDKs makes a network call, it can report what you're doing inside that app back to its provider. Because unrelated apps can use the same SDKs, that provider can see a slice of your activity across different apps.
Why this is hard to fix inside any single app
Tracking can come from a network call the app's SDK makes to a third-party server. Different apps can send tracking calls to the same destination on the network.
Blocking it at the network level, not inside each app
That's the layer Casper's Cloak works at. Instead of relying on each app to respect a permission, Casper's Cloak filters the network connections your iPhone, Mac, or Android device tries to make, and blocks known tracker and ad-network domains before they resolve — regardless of which app triggered the request. Because it works at the network level rather than inside a browser, it applies the same way whether the tracking call came from Safari, a free mobile game, a news app, or an embedded webview inside another app. One subscription covers iPhone, Mac, and Android, so the same protection travels with you across devices instead of being configured separately in each browser or app.
This won't make every tracker call disappear — some first-party analytics are harder to distinguish from traffic a service actually needs to function, and no blocklist is complete. But Casper's Cloak blocks known third-party tracking and ad-network domains.
If you want to see what's actually blocked and how coverage compares across apps rather than just in a browser, Casper's Cloak has a free trial you can run on your own phone: casperscloak.com/subscriptions. For details on what data Casper's Cloak itself handles, see the privacy policy at casperscloak.com/privacy-policy.