You might initially ask, “What does CCleaner do?” CCleaner is an app originally developed by the British company Piriform and later sold to another Czech company Avast that claims to clean up and optimize your slow computer. But is it? What Is CCleaner And Is CCleaner Good For Macs? So when you finally can’t stand how slow your Mac has become, you turn to Google for answers, and it might tell you that CCleaner for Mac is the way to go. The more you use your computer the more errors start to build up, overloaded drive slows down the processor, and resources get stretched too thin. Just like any machine, your Mac needs regular maintenance, even if it’s not as regular as one for a PC. And it’s likely that we don’t always use all the apps properly, store away files in an organized manner, and timely delete everything we don’t need. Think about it - all of us spend hours on our Macs every day for years.