ShortPixel AI or Adaptive Images is a solution offered by ShortPixel that automatically adjusts the size of your images to fit the screen of the visitor's device. This means that your images will load quickly, even on mobile devices with slower internet connections. In addition, ShortPixel Adaptive Images also compresses your images to reduce their file size. This can further improve your website's loading speed, and it will also save you storage space and bandwidth. You can buy separate SPAI credits, but you don't need to as the credits you buy for SPIO can be used for SPAI as well.