Update=== This version now crashes every several minutes on Mavericks. Completely unusable. ======== If you pay for Trillian Pro (subscription), you get multi-device message and contact sync, as well as an “always on” server which caches messages and delivers them to every device. This feature is wonderful and almost worth it. That said, I will not be renewing my subscription. The app suffers from unresponsive developers (There are multiple, years old threads on their forum about various things) and completely lacking OTR support. The iOS app also recently went through an interface overhaul which (in my opinion) was a disaster. I think there’s real potential in this app, and would even be OK renewing the premium subscription if the developers would be responsive to paying customers. For the time being I will switch back to Adium and just deal with syncing messages and accounts manually.