Tinder is a dating app that matches users to others based on geographic proximity. They can also see age, and if they have any Facebook connections in common. The Tinder app is built around the idea of the double opt-in — taking out the element of embarrassment and unwanted attention. You can only talk to someone if you both like each other. IAC was also responsible for dating sites Match.
Bumble is a free location-based dating app that uses a swiping format similar to Tinder. This means for 30 minutes, your profile will be one of the first shown to anyone who logs on. It's the same basic premise as a boost on Tinder. Only women can send the very first message, putting them in control of starting the conversation. That's why you'll sometimes see it referred to as a feminist dating app. If that person swipes right on your profile, the emoji will display when the match is made.