Runtastic is close to accurate maximum times!! Go for it!!
I like shealth. It tracks my run,walk, and when I turn on my locator it will displays my walking route that I did in my neighbor with markers of where each mile was reached. The app also help keep track of of all the nutrients and water I've consumed in a day. As well as compares it to my goal. It is a wonderful app. It really is all in one.
I use Runtastic Pro it keeps your personal records you can challenge your last section and conquer your personal records you can listen to books while running or walking are listen to your music in the app I've been using it for awhile now its a good app you should give it a try