Facebook hasn't yet begun to test Dating, but the demo version touted on stage by CEO Mark Zuckerberg and chief product officer Chris Cox looks nearly identical to Hinge.
This isn't the first time Facebook has ripped off a competitor; Instagram famously lifted Stories from Snapchat in 2016.
The high court was split, but a lower court held that copyright doesn't extend to the user interface of a computer.
Again, Facebook Dating has yet to launch, so it's impossible to know exactly how much it has in common with Hinge.
But at first glance, they seem nearly identical, not just because they have the same features but also in the way they're designed.
Instead, it works like Hinge, which has users scroll through detailed profiles.
Both Hinge and Facebook Dating also allow users to post answers to questions on their profiles, like whether they prefer dogs or cats.