Andromo is best suited to create content based apps with Images and Text. I suggest u to start with those and then move onto other kind of apps.
PS: I don't think u can create a messaging app from andromo but if you elaborate a little about what u want to add inside the app, maybe others can assist u.
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PS: I don't think u can create a messaging app from andromo but if you elaborate a little about what u want to add inside the app, maybe others can assist u.