Although more expensive than many of its competitors, e Harmony's computerized matchmaking service far undercuts the price of personal matchmaking services.
The site is available in 24 countries and 15 languages.
There are singles seeking both casual and serious relationships through and success stories of each type commend the site.
A robust mobile app has also become a key factor for on-the-move singles.
Of course, free sites don't keep users as motivated to be committed and stay active.
Read on to find out about three sites we're featuring in more detail. It matches and analyzes each member based on "29 dimensions of compatibility," a phrase its founder, Neil Clark Warren, devised during his tenure as a clinical psychologist.
Also helpful is the site's guidance on communicating during initial meetups to minimize awkward dating mishaps.
For some people, cost is the most important factor in choosing a site.
Other people are more concerned about how long it takes to set up a profile or how easy it is to communicate with matches.
Companies that require a paid subscription often have more sophisticated matchmaking systems and offer multiple formats for getting to know potential dates.
The best services offer many easy ways to narrow your options so that only the most compatible, crush-worthy candidates are presented for your perusal.
has even begun hosting themed social events where members can meet face-to-face.