The JWed app and JWed website at http://www.jwed.com are synchronized.
That said, currently there are some differences.
On the app you can swipe or search through profiles and rate each one as "Like", or "Skip". If you choose "Like" the other person will be shown your profile with priority when they are presented with profiles.
If both of you choose "Like" then a chat will be opened up and you can begin communicating. You can also send a chat request which allows you to send a short message BEFORE being matched to increase the chance the other user will like you back. Tap the mail icon on the user's profile to send a chat request.