During a hackathon in his first month, he presented the idea for a dating app called Matchbox. In January 2012, Rad was hired as General Manager of Cardify, a credit card loyalty app launched by Hatch Labs. The company's flame-themed logo remained consistent throughout the rebranding. Realizing the name MatchBox was too similar to, Rad, his co-founders, and early employees renamed the company Tinder. The hackathon was hosted by Hatch Labs, a NY-based startup incubator with a West Hollywood outpost. The original prototype for Tinder, called 'MatchBox', was built during a hackathon in February 2012 by Sean Rad and engineer Joe Munoz. As of 2021, Tinder has recorded more than 65 billion matches worldwide. In 2020, Tinder had 6.2 million subscribers and 75 million monthly active users.

In 2015, Tinder was the fifth highest-grossing mobile app, and by 2019 it was the highest-grossing app. By 2014, Tinder was registering about one billion daily 'swipes' and reported that users logged into the app on average 11 times a day. Tinder was launched by Sean Rad at a hackathon held at the Hatch Labs incubator in West Hollywood in 2012. Tinder uses a 'double opt-in' system where both users must like each other before they can exchange messages. In Tinder, users ' swipe right' to like or 'swipe left' to dislike other users' profiles, which include their photos, a short bio, and a list of their interests. Tinder is an online dating and geosocial networking application.

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