PC On/Off is a portable application that graphically displays the time a computer has been in use for the past 3 weeks. The best thing about this application is that it does not perform any registry tweaks, and does not require initiating logging. It displays the operational hours with a simple graphical overview, so you can see at what times the computer was on or off. You can even connect a network computer, and create a report of the operational hours of a computer. In the chart that is displayed, a grey fade-out indicates that the computer switched into standby mode (in Windows 7/Vista or higher), whereas, a red bar indicates that the computer was shut down unexpectedly (Windows event ID: 6008), followed by a reboot.

Features:

• doesn’t require runtimes
• doesn’t require installation
• doesn’t write to the registry
• doesn’t modify files outside of its own directories
• isn’t adware