London Bus by Zuti

Good clear map but the routefinder says that it can't find routes. Sometimes it does display the route on the map, sometimes not. The instructions for use don't seem to match what I see on the screen. If it did work as advertised it would be a really useful app. Have now abandoned this after finding that it is not being updated as bus routes change. Aug 2017

This seems very good for the area it covers but fails to reach where 4,000,000 Londoners live! OK, I know the buses near my home but not those near yours, so I can't use it to get to you.

This just got a whole lot better with the latest update which includes live departures and a much larger map. I didn't use the buses in London until I got this. Very simple to use and works well.