• Chemistry...

Advanced compatibility matching system based in part on the science of brain chemistry
Personality Profile that tells users what personality type they are, and therefore which personality types they are best suited for romantically
First-Meeting Technology will help when you decide to meet someone face-to-face for the first time
Viewable photos and profiles
Guided communication process
Multiple feedback opportunities for better matching
Access to members interested in you
On-site email
Enhanced privacy
Asks for feedback to arrive at better matches
First five matches are free
Tips and advice on dating

• eHarmony...

Guided Communication feature helps you break the ice without the awkwardness when you find a match and want to communicate for the first time
Open Communication feature allows emailing each other through eHarmony’s anonymous message system until you’re ready to share your personal information
View profiles of potential matches
In-depth personality report
Communication with potential matches
Online voice chat
Create a profile with photos
Tips and advice on dating

3 communities: Dating (for finding dates and flirting), Relationship (for finding romance), and Intimate Encounters (for exploring your wild side)
Search for like minded singles by age, location, religion, interests
Send unlimited emails, start unlimited instant messaging sessions, and contact as many members as you like
Members can respond for free, therefore Lavalife members get more replies than any other dating sites
Profile picture upload
Search and view profiles
View Videos
Send and receive Smiles
Unique features include online chat
Tips and advice on dating

Create and publish your full profile with pictures
Search for matches, view others’ full profiles with pictures, and send winks
Communicate with others through IM and email
See who’s been viewing your profile. People in this list are likely already interested in you
Get a dedicated mailbox so you can wink, email, or flirt with anyone at any time, safely and privately
Quickly find people with common interests
Excellent search options
Diverse range of members
Tips and advice on dating

Duet Compatibility System is one of the most comprehensive and reliable compatibility systems available
Searches for highly compatible matches based on your Duet profile, and it emails you when a match is found
You can use their comprehensive tools to search user profiles and initiate contact, which allows you to choose only the matches that are right for you
Members can seek advice from professional relationship experts
Create a profile with photos
Tips and advice on dating

Many singles in all areas
Profile is the key to success. You may share it selectively or post it for all to see
Search technology highlights more relevant potential dates than most dating services
You can search for a person who is already looking for someone exactly like you
It shows you who’s been looking at your profile
Freely search according to your own search criteria
Many interesting and entertaining articles
Excellent customer service