Match.com

Match.com services 24 countries and territories and hosts Web sites in 15 different languages, to help singles find the kind of relationship they’re looking for.

eHarmony

eHarmony #1 Trusted Relationship Site Move Beyond "Traditional" Online Dating.

PerfectMatch

Perfectmatch.com® (Perfectmatch), a leading online dating and relationship service.

Chemistry.com

Chemistry.com was created to bring together independent-thinking, confident, diverse singles that are serious about finding a meaningful relationship.