Those Free Apps Are Paying for Themselves — With Your Data

Think about how many free apps you have. Games, weather apps, flashlights, fitness trackers, period trackers, photo editors. None of them cost a dollar. So how do the people who built them make money?

They sell you. Or more specifically, they sell information about you.

According to the FTC, when you use a smartphone app, advertisers can use a unique advertising identifier tied to your device to track your behavior across apps and websites. They can also use something called device fingerprinting — basically reading the unique settings and configurations of your phone to recognize you even if you clear your cookies or use a different browser. And they track you across devices too, so what you browse on your phone gets connected to what you do on your laptop.

That’s just the baseline. It gets more specific.

Research published in PubMed Central found that many free apps are developed specifically for the purpose of data collection — not to provide a service, just to collect. And a lot of apps share information about what other apps you have installed with third-party data brokers. So even an app you barely use can be quietly reporting back about your whole phone.

A 2015 study that tested 110 popular free Android apps found that 73% of them shared personal information like email addresses with third parties. And 47% of iOS apps shared location data and geo-coordinates with third parties. Nearly half. Just from your phone sitting in your pocket. The specific numbers may have shifted since then, but independent researchers and regulators have continued to confirm the pattern holds.

The Electronic Frontier Foundation flagged a report that looked at 10 popular apps in the Google Play Store — including a period tracker and a makeup app — and found that personal data was being systematically shared with dozens of third-party companies. Most users had no idea it was happening.

And that’s kind of the whole point. It happens in the background, buried in a privacy policy that nobody reads, written in legal language that most adults can’t fully parse.

So what does this mean practically? A few things worth knowing:

Location data is valuable. Knowing where you go — your school, your home, your doctor’s office, the places you hang out — builds a detailed profile of your life. That profile gets sold to advertisers, and sometimes to data brokers who sell it again to whoever’s buying.

Your contacts can be collected too. Some apps request access to your contact list and then send that data off. That means your friends’ and family’s info can end up in someone else’s database because of an app YOU downloaded.

Browsing habits round out the picture. Combined with location and contacts, your browsing history lets companies build a profile that knows your age range, income bracket, health interests, relationships, and daily routine — sometimes better than your own family does.

You’re not helpless though. On both iPhone and Android, you can go into your settings and review what permissions each app actually has — camera, microphone, location, contacts. Turning off permissions you don’t understand or need is a real thing you can do right now. And being selective about what apps you install in the first place, especially free ones from developers you’ve never heard of, genuinely helps.

None of this means you need to throw your phone in a lake. But knowing that ‘free’ usually has a hidden price tag is the kind of thing that changes how you look at the app store.