Select any window on your Mac, and get an instant resizable copy that stays up to date with the original. Resize the copy. Set it above all other windows. Make as many copies of as many windows as you like.
Monitor your servers. Watch web video. Keep an eye on any window you like. Just duplicate it, tell it to stay on top, resize it to just how you want it and get on with your work.
You can duplicate windows across monitors. Drive a software demo with your notes right along side on your laptop screen, while only projecting the software you're demoing.
Have a Mac with a fancy retina display? Duplicate Windows can handle it. Whether you're copying a retina window to a non-retina display, or the other way around, we have you covered.