Tinder is famous for flirting and hookups. eHarmony is for serious relationships. Tinder is free, eHarmony requires its users to pay for additional features. eHarmony cost is high and Tinder is free. You have to swipe and look for matches on Tinder but you can’t do the “swipe right” thing in eHarmony. eHarmony chooses the match for you based on compatibility. Tinder provides freedom and eHarmony provides guidance.