Gearset fully supports all Salesforce org types, including:
Full copy sandbox
Partial copy sandbox
Developer pro org
Developer edition org
Professional edition org
Partner edition org
This mean you can deploy from and to any of the environments listed.
For more information on adding org connections, see our managing orgs article.
Note that for data deployments, Professional edition orgs need the Async API enabled (which users have reported to incur an extra cost) to work.