Is CleanMyMac X safe?

Never install any app that claims to "tune up", "speed up" or "clean up" your Mac. These apps exist for one reason: to separate the unwary and inexperienced user from their hard-earned money. At best they do very little, at worst, they can damage your OS installation and cause far more problems than they "solve".

Your Mac doesn't get "dirty" and doesn't need cleaning.

Do you really think a small shareware shop somewhere is better than Apple at fine tuning the OS?

The main reason is because it is known to remove files it shouldn't to the point of needing to reinstall the OS. Stay away from it.

It has always been bad. It does nothing useful. It's good at removing files it shouldn't.

Never install any app that claims to clean, speed up or optimize your Mac.

You're welcome.