Can we restrict access for employees to see only their time and not everyone in the organization, or grant privileges to certain supervisors to see certain employees time, but not others?

TimeCard is primarily designed to be a very effective tool for reporting what has been done, with the Outlook Calendar as a base. That information is then posted to a database where you can do anything with it.

I also provide a reporting tool called OLAP Reporting Tool, which is good for exploring the data and building custom reports. However, I do not have the kind of user management or permissions infrastructure that you are asking for.

If you need that kind of solution I would be happy to build you a custom solution that connects the database to your economy system.