Both MacBooster and MacKeeper’s cleaning and optimizing functions are very similar overall. So, how to pick just one? If you want to save extra cash, then MacBooster is the best option for you. Even if you’re covering multiple devices, prices remain surprisingly low, so it’s a perfect solution for families. However, it’s easy to see why MacKeeper may sway you over. The service offers a whole host of extra features that go way beyond Mac optimization and are extremely helpful in staying safe online. No matter which optimizer you prefer, your Mac will get a much-needed performance boost that will certainly help extend its lifespan.