Remember: It’s Not a Disk Repair Utility
All it does is clean your disk of some logs and caches. There are dozens of apps that do the same thing. Yes it’s a utility but a low-grade one. Like change the windshield fluid in your car sort of level of utility.
For what it does it’s not bad. It lacks some of the fine control other apps have.
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Disk Doctor: System Cleaner, v3.4