Completely free, Appcleaner runs on donations and removes files and software that you don’t need anymore. If you’re looking to unclog your device and have it working super smoothly, Appcleaner is the best free app for Mac you need. It can also be incredibly challenging to look into every file and folder to find unwanted material. You’ll agree that the biggest thing that can clog up our computers and make them lose their initial snappiness is an overload of apps, cache, and trash.