Memory Diag is described as 'Memory Cleaner keeps your systems memory (RAM) clean by monitoring and optimizing the memory usage. Helps you to quickly access detailed memory information and diagnosis from your menu bar and CLEAN your memory with a simple click' and is an app in the OS & Utilities category. There are five alternatives to Memory Diag for Mac, Windows, Linux, Online / Web-based and Firefox. The best alternative is Memory Clean. It's not free, so if you're looking for a free alternative, you could try CleanMem or Memory Cleaner X. Other great apps like Memory Diag are FreeMemory (Free) and Memory Optimizer by Andy (Free).
Memory Clean is the ultimate app for optimizing your Mac's memory and is best used after you have finished using a memory (RAM) intensive app or game. With the slickest interface and user experience, Memory Clean stands head and shoulders above the rest.
Memory Cleaner X cleans inactive RAM from your computer that allows you to have more applications opened simultaneously and get things done faster. The app forces the system to recover wasted memory and make it available to processes that need it.