It has a cycle function
It'll track distance vs time, and includes elevation (so can then work out speed and energy expenditure), and plots it all on a map for you. It's free on the app store for January, and seems to work well.
( Labia Majora You keep on talking but it makes no sense at all, Tue 18 Jan 2011, 11:32, 1 reply, 15 years ago)

OK, that's not quite what I meant
if you cycle the route at, say, 10mph and again at 20mph does it record 4 times as much energy burnt? I wasn't sure running apps bothered factoring the wind resistance squared thing.
( the mighty badger Aphrodite, on a bar stool, by your side, Tue 18 Jan 2011, 11:35, Reply)

I don't know, only started using it yesterday :/
I'm certain it won't factor in wind resistance though.
( Labia Majora You keep on talking but it makes no sense at all, Tue 18 Jan 2011, 11:37, Reply)

sorry, I'm being a tool
I meant 8 times as much energy. KE goes with velocity^2, so travelling twice as fast requires 4 times as much energy just for the speed, and then wind resistance is related to v^2 as well, so it's probably close to 8 times as much energy to actually cycle twice as fast. Test it out!
( the mighty badger Aphrodite, on a bar stool, by your side, Tue 18 Jan 2011, 11:41, Reply)

I'll see how it goes
I'm starting to record all my trips, and as I get fitter I'll be able to cycle faster.
( Labia Majora You keep on talking but it makes no sense at all, Tue 18 Jan 2011, 11:43, Reply)