Hey lindseyk21,

Thank for chiming in on the thread. Employees will not be able to use the app as long as you have the box in Company Settings>>Time Options>>Time Entry unchecked that says, "Allow team members to track time on the mobile app." For more security, I recommend using those steps my colleague Jessica_young mentioned above to set up an Access Restriction so that the employees can't use a computer to log in either. 

Please let me know if you need further clarification! I will be on standby. I hope you have a wonderful day.