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Every page here says what the other product is good at, because a comparison nobody believes sells nothing. What DiskDuo claims about itself, this codebase can back.
If you want one app to look after a Mac and do not mind paying every year, CleanMyMac covers more ground. If you want to see exactly where your space went, decide for yourself what goes, and pay once, that is what DiskDuo is for.
If you want a familiar cleaner across both Windows and macOS, CCleaner is the one with that reach. If you want a tool that treats a Mac as a Mac, DiskDuo is written for nothing else.
On Windows, Wise Disk Cleaner is a sensible free choice. On a Mac you need something else, and the thing to insist on is that it shows you every file before it removes anything, and that it moves them to the Trash.
If all you want is the most elegant way to see your disk, DaisyDisk is a fine buy. If you want the map and the work that follows — duplicates, uninstalling, security, a menu bar monitor — DiskDuo is one purchase for the lot.
What does it show you before it removes anything? The answer should be “every file, with its size and where it came from”. If a button says “clean” and a number goes down, you have not been shown anything.
Where do the files go? The Trash, so a mistake costs you a restore rather than a backup. DiskDuo has no immediate-delete default and no shortcut for it.
What leaves the machine? Read the privacy policy before you install. DiskDuo collects nothing: no analytics, no crash reporting, and no file names anywhere.
One payment, no subscription. macOS 14 or later.