Swipe right…into trouble.

Tinder users already in a relationship are about to get busted. A new website called Swipe Buster allows people to check if someone they are involved with is active on the dating app.

For $5, you can search the name, age, and location of the person you’re trying to catch in the act. How it works: Swipe Buster fishes the data from Tinder’s public application programming interface, which holds user information, and the name and information you search will pop up from within the codes. The site, originally called “Tinder Buster,” launched last week. The software genius who invented the tool wants to remain anonymous, although he did tell Vanity Fair that he just wants people's data to be protected.

“There is too much data about people that people themselves don’t know is available,” he told me over the phone. “Not only are people oversharing and putting out a lot of information about themselves, but companies are also not doing enough to let people know they’re doing it.”

The site appears useful—a survey done by GlobalWebIndex found that 42 percent of the Twitter users it sampled were in a relationship, and 30 percent of them were married. Tinder shot back with a tweet saying, “Our actual data says that 1.7% of Tinder users are married — not 30% as the preposterous GlobalWebIndex article indicated.”

Previously, the only way to catch a cheater on the app was to create a (possibly fake) Tinder profile, and keep swiping in your area until you located the culprit.