It does one thing. It does it well. It doesn't try to get me to buy anything. Win, win, win!
1. Enter the distance. Tap to toggle miles vs km.
2. Type in the hours (if any), minutes, and seconds.
3. View your pace (and speed).
Bonus: you can directly edit your pace to see the corresponding time for that distance!
Suggested improvement: I think it might be more convenient for some users to have spinny wheels to enter the hours, minutes, and seconds, and also to subsequently edit the pace to see a revised time.
3.