Chemistry.com, brought to you by the Match.com people, is all about Compatibility and has similar features to eHarmony.

Your Chemistry.com journey starts with a free personality profile, that may take some time and thought to complete, but is designed to match you to someone whose personality and ideals are similar to your own.

Once you submit your profile, you will begin to receive photos and profiles that match your own via email. Those who buy a full membership may then choose to communicate with their matched members through Chemistry.com's 1-2-3 Meet system.