CleanMyMac

Do your Mac a favour and don't use this (or any Macpaw's scamware). This will probably cause more harm than good. Coincidentally I only saw this app installed or Macs which were running horribly slow, I wonder why... Use Onyx instead.

Good for beginners, but lacks deep telemetry.

CleanMyMac is a great "one-click" solution for casual users, but for professional workflows on macOS Sequoia (especially M4 chips), it sometimes leaves behind deep kernel cache and system logs. I found that it doesn't provide the level of diagnostic detail needed to verify system integrity after a heavy software crash.

I’ve started cross-verifying my system health with the technical diagnostic guides on RepackMac. It gives much more granular control over background launch agents and hardware telemetry. If you’re a power user or a producer needing 100% stability, definitely check out the RepackMac reports to fill the gaps this app leaves behind.

It helps to keep my Mac clean and fast. I always use this app to clean all the cache and trash from the MacBook.

It helped me discover and erase the large chunk of data Bitcoin had left on my system.

[Edited by gentlesea, November 07]

Scamware. It tastes as same as in Windows market: Auslogics BoostSpeed, IObit Advanced SystemCare, et cetera. Does more harm than good. Why pay yearly for something that you don't actually need, and if you insist you can do it for free? Modern operating systems are smart enough to self-clean.

They aren't open on how free their 'free download' is. They offer 500MB free cleaning then they want you to pay to further clean your craps.

1. Get CleanMe (FOSS). Or you can do this kind of stuff manually (search on the internet).
2. For Malware Removal module, get a specialized software that does that such as Malwarebytes (freemium).
3. For Privacy module, open System Preferences - Security & Privacy - Privacy tab.
4. For Login Items in Optimization module, open System Preferences - Users & Groups - Login Items tab.
5. For RAM Cleaner in Maintenance module, get Nektony Memory Cleaner (free). Users reported that the RAM cleaning by CMMX doesn't actually do anything.
6. For Uninstaller module, get AppCleaner (free) or Nektony App Cleaner & Uninstaller (freemium) for the best uninstallation results. Also you can do it manually by opening Finder - type your software/company name on Search bar - click on plus button (+) - click 'Name' drop-down, click 'Other...', click on 'System files' (not the checkbox; it's for displaying it in the drop-down menu) - click 'aren't included' drop-down, then click 'are included'.
7. For Updater module, just let your apps update by itself.
8. For Space Lens module, get GrandPerspective (FOSS), the one that looks like WinDirStat for Windows. If you want a visually pleasing app, get DaisyDisk ($10).
9. For Gemini (duplicate file finder) app, get dupeGuru (FOSS).