It does route planning only and not mapping, but that's not really needed if you just punch in the bus or tram start and end stand (plus it can guess the closest stand from the location).
@richlv the only thing stopping me from using @organicmaps more is the fact that they don't support buses or trams in public transport routing. For now, I use Magic Earth for that purpose and Organic Maps for when I don't need public transport.