This is great, I'm trying to think why olark / liveperson / intercom.io don't have something like this, it's brilliant.
+1 for taking the time changing Bootstrap colors a little<p>one constructive comment, I wanted to click "home" (to (voicegem.com) but could not find a link, I just edited the URL manually, but adding a homepage link would have been nice.<p>and another one, really small one, it took me a while to notice the "remember my choice" for approving the microphone, I would do that as a checkbox, default on, it's hard to notice, and once I gave you permission, I trust you not to eaves drop on me.