Couch to 5K - which app?

Hi, ladies,

So I'm interested in improving my 5K-a-day plan to go from walking to running, and a few people have mentioned doing a program called Couch to 5K, but when I looked it up on my iPhone, there are several to choose from. Which one is the best one?

Thanks, all!

Roxy

This is the one I used. Loved it because I could play my own music!

http://www.c25kapp.com/

Awesome, thanks!