What are some alternatives?
When comparing Defraggler and PerfectDisk, you can also consider the following products
UltraDefrag - UltraDefrag is an open source disk defragmenter for Windows.
IObit Smart Defrag - Disk defrag your Windows with Smart Defrag freeware, Your first choice for defragging windows 10, 8, 7, XP and Vista. Download Free disk defragmenter now!
Auslogics Disk Defrag Touch - The smart way to defragment a touch-screen computer running Windows.
MyDefrag - MyDefrag (previously JkDefrag) is a disk defragmenter and optimizer (a maintenance utility to make...
Windows Disk Defragmenter - Disk Defragmenter is a computer program included in Microsoft Windows designed to increase access...
Puran Defrag - Puran Defrag Description.