Is there a good oLark alternative for 1-on-1 chat?

We have played around with an oLark plugin that lets our readers IM us directly from our WordPress site, and loved it. They chat (even anonymously) directly from the site, and we get it in our IM client.

But... The oLark plugin is orphaned, and had limitations on the number of chat sessions per month.

Is there anything else like this out there?

We signed up form WPMU DEV in part because we hoped the chat plugin would be a good replacement, but it is not at all what we expected. We aren't looking for a chat room, and when we tried it the chats were way too laggy to be interactive.

Is there any other good chat alternatives to be found? We love chatting with our readers - there has got to be a way!

- Chris // http://www.technomadia.com