Didn't have time to test a lot of the functionality, but it seems to work fine in OS X 10.11.6 with Fritz!Box 7490 and the latest firmware. Two things though: you can't seem to set auto-launch at login from the software preferences, so you need to do it manually in Users & Groups preference pane, and (more importantly) I don't like the fact that the main app always has to be running. Wouldn't the menu bar item alone be enough? I don't really need visibility in the Dock, i.e. as a "real app", unless I need it. (Therefore only 4 stars.)