The apps are fun coding games that you can try at home.
Another idea for STEM at home that does not involve technology is the circles creativity challenge. This challenge can be found here:
https://carlyandadam.com/thecarlyandadam/creativity-challenges-and-stem
If you don't have a printer, all you need to do is trace 12 circles for younger students or 30 students for older students. Give three minutes for the circles to be turned into objects (the sun, soccer ball, etc.) It's an opportunity for your child to show their creativity while having fun!