More than a PDF map. Gets job done. – MetroMan Beijing Review

Good: Bilingual names, timetable, station maps, routing. Bad: no overlay for routing. This one is more than a PDF map. It tries to route for you by letting you search for start and end stations. The it displays the route in text with estimated travel times. My gripe is that it should display that as an overlay in the map too. Good enough to keep in your iPhone for reference.
Review by Durianwool on MetroMan Beijing.