I like Pacer and their metals. Its only 4 stars cause I use these apps to keep me going, not to complete it all in one shot. I also use Conquorer but Conquorer allows me to choose to complete the run a bit at a time or all at once and allows me to set my time frame. Pacer didnt allow me either of those choices. I have 1 month to find the time to do 13 straight miles in 1 go. Id like to have known that when I signed up but I dont recall being informed.