Cleaning up a Mac can turn into a full-time job if you let downloads, caches, old installers, and forgotten project files pile up. Disk cleanup apps are interesting because they turn that vague feeling of "my computer is full" into something you can actually scan and act on.
This old review looked at a small Mac App Store utility called Disk. The idea was straightforward: help you see where space is going and make cleanup less annoying.
Tools like this are useful, but I always approach them with a little caution. I want visibility first and deletion second. Show me the big folders, show me what is safe to remove, and do not make it too easy to delete something important just because it looks large.
The takeaway still applies today. A cleanup app can be helpful, especially on smaller SSDs, but it should support your judgment rather than replace it. Start with obvious junk, keep a backup, and avoid any app that treats aggressive deletion like a personality trait.