App tracking means an app follows what you do across other companies' apps and websites, then links that activity to you or your device to build a profile, mostly for targeted advertising. It often uses a device advertising ID. It is not the same as an app using your data inside itself. You can limit or turn off this cross-app tracking on both iPhone and Android.
Why this happens
Apps and advertisers make money by showing targeted ads, which are more valuable when they know your interests. To do that, they share identifiers and behavior data so your activity in one app can be matched with your activity elsewhere.
This is usually done with an advertising ID assigned to your device, plus data like what you tap, buy, or view. Combined across many apps and sites, it builds a detailed profile even without your name attached.
Is this normal?
Yes, it is widespread across free apps that rely on advertising. Both Apple and Google now require apps to ask permission or provide controls, so tracking is common but no longer silent by default.
Does it cause any problems?
It is mainly a privacy concern rather than a direct security threat. The downsides are detailed profiling, data being shared with third parties, and less control over where your information ends up.
How to fix or check it
- On iPhone, go to Settings, Privacy and Security, Tracking, and turn off Allow Apps to Request to Track.
- On iPhone, use Settings, Privacy and Security, Apple Advertising to turn off personalized ads.
- On Android, open Settings, then Privacy or Security and Privacy, then Ads, and choose Delete advertising ID.
- Review app permissions and remove access to location, contacts, and other data an app does not need.
- Decline tracking when an app asks, and check the app's data-collection summary in the store listing.
- Use a browser with tracking protection for web browsing on both platforms.
Frequently asked questions
Is app tracking the same as spying?
No. It usually collects behavior tied to an advertising ID for ads, not your private messages. It is a privacy issue, but not the same as active surveillance.
Does turning off tracking stop all ads?
No. You will still see ads, but they will be less personalized and based on less data about your activity across other apps.
What is an advertising ID?
It is a resettable number your phone assigns for ad targeting. You can reset or delete it in your phone's settings to break the profile built around it.