ClearTime for Mac OS X is a combined clock and alarm/notification system that's fully configurable. The clock can be configured to be a normal window, transparent window, or a fully clear window that allows the user to "click through" to the desktop underneath. The alarms can use one of two built in internal alarms named "Alarm Clock" and "Red Alert" or the user may select their own music, a voice recording, or nothing at all. The alarms can be easily configured and edited to make repeating alarms and come in three user configurable sizes (small, medium, and large). The alarms can also be configured to wake a sleeping system up one minute before a scheduled alarm is set to go off.
The product is fully functional however there is an internal time limit that will limit each user session to 60 minutes. There is, however, no expiration date, so the user can try it in this mode as long as they like.