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.