Casper's Cloak blocks Facebook SDK, Google Analytics, Mixpanel, Segment, AppsFlyer, and ~50,000 other trackers — at the network level, in every app on your iPhone, Mac, and Android. iOS App Tracking Transparency only catches some of them; Casper catches the rest, including the CNAME-cloaked first-party-looking trackers browser extensions can't see.
Apple's "Ask App Not to Track" prompt only addresses one of the many ways apps follow you. Here's what Casper catches that the system can't.
Mixpanel, Segment, Amplitude, FullStory, Hotjar, and every other behavioral analytics SDK report back at the network level. They're invisible to ATT, invisible to your browser. Casper blocks the connections directly.
Apps and SDKs use device fingerprints (screen + fonts + timezone + accelerometer noise) to re-identify you across apps even with ATT enabled. By blocking the SDKs at the network layer, the fingerprints have nowhere to go.
Embedded in ~30% of mobile apps. Reports your in-app activity back to Meta whether or not you have a Facebook account or are logged in. Casper blocks every connection to graph.facebook.com, connect.facebook.net, etc.
LiveRamp, Acxiom, Experian Marketing Services, the IAB cohort. They aggregate signals from thousands of apps into a behavior profile that gets sold. Block the SDK that ingests, break the pipeline.
Modern evasion: bigsite.com creates an alias (trk.bigsite.com → really hotjar.com). Looks first-party to browsers. Casper resolves the alias chain and blocks based on the actual destination.
The default blocklist spares functional endpoints — Google/Apple/Microsoft sign-on, payment, banking, 2FA. You stop being tracked WITHOUT losing the apps you use.
The pipeline from your tap to a data broker's profile of you. Casper breaks it at step 2.
The app developer embeds 3–15 third-party SDKs to monetize: Facebook SDK, Google Analytics, Mixpanel, AppsFlyer, Adjust. You see the app; you don't see the SDKs.
Every time you open the app, scroll a screen, or tap a button, the embedded SDKs phone home: hashed email, IDFA (when allowed), IP, device fingerprint, timestamps, screen names, button labels. Casper intercepts these connections at the DNS layer and refuses to resolve.
LiveRamp, Acxiom, Experian Marketing Services merge the signals from thousands of apps into a single profile per device. Cross-referenced with public records, this profile is more detailed than your credit report.
To advertisers (obvious), insurers (less obvious — health predictions from app behavior), employers (background-check enrichment), and sometimes governments. The market for this data is multi-billion-dollar.
The DNS query never resolves; the SDK never reaches its server; the brokers never receive the signal. No profile-building. The app works (mostly — see FAQ on edge cases) because functional endpoints stay open.
What privacy-conscious users ask first.
Free trial. iOS, Mac, and Android. Block ~50,000 trackers by default — including the ones ATT and browser extensions can't see.