If you leave your machine on all the time, the built-in optimization tools in macOS and Windows may negate the need to ever manually defrag, as both companies note.

Defragmentation and disk optimization in Mac OS X collectively represent an issue nearly as contentious as the debate over repairing disk permissions -- one camp argues that utilties purportedly ...

When it come to disk fragmentation, a small amount of proactive maintenance can have a big impact on help desk call volumes.

Overview: Regular maintenance using optimization tools improves laptop speed, stability, and responsiveness without needing ...

It's very configurable and much more power-user oriented than something like TechTool Pro. Almost intimidatingly so. And it's not just a defragmentation utility, it also does optimization as well.