The alpha version is available as a free download from the BlueStacks website. In the very near future, BlueStacks will let you select from over 400,000 Android apps to play on your Mac. You can test drive a fixed set of curated apps for the first release (alpha-1). The BlueStacks App Player for Mac OSX (alpha) supports both Lion and Snow Leopard. Their support page claims that 'in the very near future', they plan on opening the Mac version up to over 400,000 Android apps:

The bundled apps include Air Control Lite, Alchemy, Basketball Shot, Drag Racing, Elastic World, Facebook, Glow Hockey, Guns'n'Glory, Paper Toss, Pulse, Robo Defense, Seesmic, Twitter, Whatsapp, and Zebra Paint. While the Windows version allows you to run any Android app without modification, the early Mac version seems to be limited to 15 initial apps that comes bundled with the download. You may be wondering, how does it perform compare to M1 Macs Here is.

The software allows users to run Android apps directly on their Windows PCs, and the newest version begins to extend that functionality to the Mac. In fact, Bluestacks cannot be download on M1 Mac since it is still programmed for Intel-based Mac and other Windows computer. The company had originally released a beta version of their App Player for Windows back in March. BlueStacks announced a public alpha version of their Android App Player for the Mac today at Google I/O.

Bluestacks m1 mac