Tinder

Tinder invented the swipe and remains the most-downloaded dating app worldwide. Its biggest strength is sheer volume: wherever you are, it's where the most people are, so there are more potential matches. The basics are free; paid tiers (Tinder+, Gold, Platinum) add unlimited likes, rewind, Passport (change location) and the ability to see who already liked you. Intentions vary from casual to serious — be clear in your profile to attract the right people.