Share Database Between React Native Apps


I am currently using AsynStorage in my React Native Apps, currently i need to share the database between apps.Since Asynstorage cannot be used between apps can we use realm database.

The Use case is simple:-
I have two Apps say App A and App B now when user opens App A he needs to login and once successfully logged in i store the username in App A database(AsyncStorage) now when user opens App B then i need the username here to avoid the user to type each time.

Kindly provide your suggestions.