Where can I find an overview of my plan and quotas?

Click on your profile icon (the blue dot) in the top right corner of your Perspective account.

Select the "Settings" tab.

Under "Subscription," you are able to view your current plan. In this section, you can "Manage Plan" and see an overview of your quotas.
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Another thing you can check here is the number of visitors, funnels, and domains that are currently available in your account.