This is a great look at several ways you could build an app to help others. Apple is betting that ARKit will open up augmented reality to the masses like never before. When I developed Quit That!, my app to help you quit things, I had no idea how many people it would help. I get several emails a week thanking me for the app. It's very rewarding.
This is a very interesting read with ten ways you could develop an app with ARKit, helping those with autism.
ARKit and Autism: New Futures by Craig Smith