Rethink Workflow offers a quick glance at the usage statistics according to the subscription plan that your organization is in.
To view the usage statistics, as an administrator, click on the "hamburger menu", expand the "Settings" section, and click on "Subscription Plan"
Below the available subscription plans, you should see your organization usage statistics:
An internal workflow can only be initiated only by individuals belong to the same company. A public workflow allows individuals outside or inside of the same company to initiate.
How to design
You can indicate a workflow to be internal or public using "Public" option on VARIANT tab of the workflow design page.
When Public set to Yes, anyone from outside of your organization can initiate a new document by using the link generated in "Public URL."