The best alternatives to Astro are Navdy, PhoneCast, and Pearl RearVision. If these 3 options don't work for you, we've listed a few more alternatives below.
Navdy is an innovative head-up display for your car. It makes your phone and your car work together and at the same time you are behind the wheel, concentrated on the road. It is here to make your life and commuting smarter, happier, more organized and protected. With its help you can play music, call and talk, navigate and much more.
Mirror iPhone/iPad to your Mac wirelessly. No need to connect iPhone/iPad to Mac with a cable. Demo what's on your iPhone/iPad in online meeting, play games, draw live. PhoneCast is a universal purchase app so you buy once and use it on iPhone, iPad and Mac.