They both rely on swiping left or right and location sharing and are almost exactly the same in terms of how they look and function.

What parents need to know: You can log in to both Hot or Not and Badoo using email or Facebook.

If you sign up via email, you have to enter a birth date that indicates you're over 18, though there's no verification.

When teens 13 and older try to log in to Badoo via Facebook, they can, but the Hot or Not app doesn't allow it.

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Friendable believes "Everything starts with Friendship" so what are you waiting for, connect with singles nearby, who are ready to meet and are available now.

However, Hot or Not is also an app within Facebook, so teens under 18 can access it there.

Teens can set the age preference of potential matches anywhere from 18 to 80, and most matches during testing were about 50 miles away.

Friendable can always be used for FREE should users choose not to access any of the Plus services.

All photos are of models and are used for illustrative purposes only.

Keep lines of communication open, especially since teens sometimes hide these apps in "vaults" or apps that look harmless (such as a calculator).

Talk to them about how they approach dating and relationships and how to create a healthy, fulfilling one -- and note that these usually require more than a swipe.

But these apps are a fact of life for many teens (especially LGBTQ youth who may not have a supportive community at school).