The Active User Report will give you a list of the number of submissions submitted by each user for a particular App. This is great for tracking your users' GoCanvas usage.
You can locate the Active User Report by clicking the Reports button in the Home area.
Select an App and a date range for the report:
The View option will give you a web view of your data including the Name, Submitted Count, and Last Submitted dates:
The Export option will download a CSV file with your data that you can open in a program like Excel.