When you open your Activity page, it shows your daily log with active and idle time recorded. The average daily activity level is shown as a percentage at the top-right of the Activity page. Activity percentage for each 10-minute time interval is shown to the bottom-right of screenshot thumbnails.
Traqq measures user activity based on keystrokes and mouse movements. Therefore, not using your device while the time tracker is active will show your activity level as 0%.
The colors on your timeline correspond to your activity levels per screenshot.
Green: high activity, 60-100%
Yellow: moderate activity, 40-59%
Red: low activity. 0-39%
The dates on the calendar are also marked (underlined) in colors corresponding to the average daily activity level.