Unsurprisingly, many are based around adult content—especially peer-to-peer video chatting, free pornography, and casual sex. That said, many con apps aren’t based around adult content; plenty of other categories—photo/video filters, quizzes and games, health and wellness, and backgrounds or UI themes—are common targets as well.

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A more recent example, as pointed out by Kosta Eleftheriou on Twitter, is Star Gazer+. At the time of Eleftheriou’s Tweets, the app had over 80,000 ratings averaging 4.6 stars (as of this writing, it now has a 4.4-star rating based on over 1,100 reviews). At first glance, it seems like this is a legit app—however, read through the reviews and you’ll find a very different story. The majority are 1 star, and almost all of them call out egregious, unexpected in-app purchases. Many users found they were signed up for a costly subscription simply for tapping an “update” button.

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Despite the negative reviews and user complaints, Star Gazer+ is still available on the App Store with a favorable average rating and many obviously fake 5-star reviews—as are hundreds of other scam apps. Some of these apps have managed to bilk hundreds of thousands of dollars in total revenue from users in just the last year.

It’s surprising that so many con apps skirt the App Store’s strict policies, but their prevalence suggests Apple is unable—or unwilling—to deal with them properly. Sure, maybe these app developers aren’t breaking a law or infecting users with malware, but they’re still acting maliciously. And until Apple takes this issue seriously, it’s up to the user to keep these products off their devices.

Here are some tips to keep yourself safe from scam apps on the App Store:

• Read user reviews thoroughly before downloading. Yes, even if the average scores are high and there are tons of them. If you look hard enough and comb through the reviews, you’ll find some calling out these apps for being scams.

• Check outside sources. Cross-reference unfamiliar apps on user forums, Reddit, and blogs like Apps Exposed before downloading.

• Know your device’s limitations. If an app flaunts features or services that seem too good to be true, it’s probably a fake. Don’t download it or buy anything it’s selling.

• Look out for hidden subscriptions. While many free apps offer extra paid premium features and in-app purchases, don’t subscribe to an app to use features or access content that is freely available elsewhere.

• Call-out scams if you find one. Shady developers upload new scam apps all the time, and it’s impossible to catch them all before someone gets duped. If an app unexpectedly charges you, report suspicious activity Apple and leave a review warning others the app is a scam.

Bottom line: An unfamiliar app should always be approached with caution. When in doubt, don’t put them on your device—and keep your finger (or Face ID) away from any typical in-app purchase approval methods, too.