Running Log Free
As you'd expect from the name, Running Log is the perfect app for logging all your running stats. You can see at a glance what you've achieved that day, or even over the past month. In fact, the month view is a really interesting one. You get to see your cumulative stats, exactly what distance you covered, your average speed over the month, and more. A quick tap will give you similar stats for the week, as well.
You can also add information that is absent in other running apps, such as what type of run you went on (cross-country, race, interval, and so on), and effort level (you be the judge, or let the treadmill tell you). You can even record rest days. A particularly nice touch is that you can give different runs different names, so it can be really unique to you without having to include erroneous data about where you went.
Little icons on the running log also help you see at a glance if there is any pattern to your workouts, or if you seem to run better on particular days, or on particular runs. This is a nice touch.
The free version has those ads, which do get annoying. That, however, would seem to be the only benefit of upgrading to the paid-for version.