The biggest issue with any of the activity tracking systems, be it a Fitbit or Jawbone Up, is that some information has to be manually entered by the user. For example, when I'm tracking how much water I drink in a given day, I have to remember to enter it into the Fitbit app, and I'm horrible at it.
There's two versions of the app, one is free, but requires you to use NFC tags purchased through the app. The other version is a pro version, which allows you to use any compatible NFC tag and costs $1.99.
The creation process (using previously purchased NFC tags) was painless; scan the blank tag, confirm you want to associate it with FitTap, and then assign a task to the tag. You can assign a tag to log an activity, food, sleep, water or weight. Each category has all of the appropriate fields required when logging the same activity with Fitbit.
If you have a set workout consisting of the same time and distance on a treadmill, you could create a tag and place it on or near the treadmill. When you finish your routine, you can then scan the tag and go about your day; logging your activity in a fraction of the time it would take you to enter it into the Fitbit app.