Do you need Squeaky at all?

macOS already ships good tools. Here is honestly where they stop and where Squeaky starts.

What you want to domacOS built-in toolsSqueaky
See what is using your disk ✓ Storage settings list categories ✓ Disk map down to each folder and file
Find caches, logs and leftovers — Mostly hidden; you hunt them in Finder ✓ One scan, 18 junk categories
Clean them up safely — Move to Trash by hand, one item at a time ✓ To the Trash first (unless you turn on Empty Trash after cleaning); protected paths untouched
Uninstall an app completely — Drag to Trash leaves support files behind ✓ App plus its leftovers
Find large, old and duplicate files — Large files and Downloads in Storage settings; no duplicate finder ✓ Clutter finds all three
Review startup and login items ✓ Login Items in System Settings ✓ Same list, with what each item does
Block known malware ✓ XProtect, built into macOS ✓ Checks startup items, shell settings and files against known malware
Watch memory, CPU and battery ✓ Activity Monitor ✓ Live in the menu bar
Run maintenance tasks — Terminal commands ✓ One click in Optimize
Price ✓ Free ✓ Free scan; Pro is one yearly plan

When the built-in tools are enough

If your disk has plenty of room, you rarely install and remove apps, and you are comfortable in Finder, you may not need Squeaky. Storage settings, Activity Monitor and XProtect cover the basics well, and we would rather you know that than buy something you will not use.

When Squeaky earns its place

When the disk keeps filling up and you cannot see why. When "Delete" in Finder feels risky. When an uninstalled app keeps leaving pieces behind. Squeaky shows everything in one place, explains each item, and only removes what you choose, to the Trash first unless you tell it to empty the Trash.

Squeaky works alongside XProtect, not instead of it: it is a cleaning and maintenance tool, not a replacement for macOS's own protections.