Flipd can be used to create a sophisticated productivity system that tracks all of your activities and organizes them neatly into specific categories.
In the Activity Library, you can select from a list of existing tags, or you can delete those and add or edit your own. Whenever you use Flipd, tag your session according to what you were doing. Each time you use a tag, your stats will appear under the corresponding category.
Here's more on how this feature works: