The following are apps that I have used on my phone and found very useful. I have an Android phone, so some of these apps may also be available on Apple, but some may not.
This app allows you to enter a set of options, and it will randomly generate a choice for you by spinning a wheel. I use it to help me pick which exercises to do when I am exercising. The app works really smoothly and easily. I think this app would be really helpful in any situation where you want to make a random choice, for example, deciding what to have for dinner, or deciding who goes first in a game.