Regional train lines only
I live in Paris and it seems the map only shows the regional train lines (RER) and none of the metro lines. If this was designed for tourists, it is essentially useless as the metro is a better option for getting around. If this app was designed for Parisians, we dont need it, as the RATP app works perfectly for our needs.
zdarma about
Paris Transport Map - Metro Map and Route Planner, v4.5.0