You can also connect directly to the Pulse database to see who is using Perspectives (Context = ‘Architect’). You can refer to the following post where I explain how to track Arc usage:
After connected to the Pulse database, your query will be
Select DISTINCT UserName From Session Where Context = 'Architect'
TM1 shows the same context value Architect if you are connected to TM1 using Architect or Perspectives.