Disk Doctor: System Cleaner 4+

It would be better if it can also search for useless spyware/adware on my computer though

Even if it says it works on Catalina, I simply can not open the app! Please fix this!

I use my desktop Mac every day (and sometimes, half the night, too). I don’t care what brand you use, in the kinds of use my Mac gets, ‘problems’ might crop up anytime. Just a few minutes at startup time helps my ‘Apple, a day’ keep running along just fine. I think I’ve been using Disk Doctor by FIPLAB Ltd. since about version 1 or about there. Anyway I use it and like it and my winning hand list of APPs keeps growing and growing. I usually try/buy only one APP at a time, from any company. If I like whatever APP I’ve gotten and depending on other Mac related opinions and reviews I will take a chance on some other ‘one' APP at a time. My NEW APPs are usually version 2 or later. FIPLAD Ltd. is the only company I’ve ever bought a version 1 APP. from. So far I’ve never been dissatisfied with any APP I’ve boughten from them.
For more, CHECK MY REVIEWS FOR ‘DISK AID’ and ‘Shortcut Bar’ by ‘FIPLAB Ltd.'