appear.in seems to be exactly the same a vline.com, or perhaps it's the other way around(?).
I kind of thought they were the same service for a second, but when I tried visiting vline.com again it was not redirected.
They seem to be offering the exact same service using WebRTC, facing the same problems of browser compability.
It will be fun to see how they both evolve.
Bias warning: I work for appear.in.