SharGate Overcast has two pricing plans:
Free: For businesses with less than $50,000 in annual Azure costs. Learn more.
Enterprise: For businesses with more than $50,000 in annual Azure costs. Learn more.
If you start with the free version, but during the course of your organization's life, your Azure costs exceed 50k in annual costs, you will automatically be moved to a trial version of ShareGate Overcast Enterprise.