Hello, is it possible to use firebase from 2 app With inventor app? One of them is only to read data from firebase
yes, that is the whole idea of firebase 
However, if using the MIT Firebase access instead of your own project, you may need to copy the token across to the second app. (or MIT have to give you special access)
Ok, thank you very much, I'll try it tomorrow and I'll tell you if I can or what I'm doing wrong.