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Yes, both HubDesk and Zendesk Support offer a Free Trial.
HubDesk is designed for Medium Business and Small Business.
Zendesk Support is designed for Large Enterprises, Medium Business and Small Business.
Pricing for HubDesk Starts at $16.67/Month when Billed Yearly whereas for Zendesk Support Starts at $19/user/month when yearly.
Some top alternatives to HubDesk includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Jira, FogBugz, Sprintly, Issuetrak, TaskSift, Height, Qualified, Suptask, Sweetjab, Workvivo, Stepsize and IFTTT.
Some top alternatives to Zendesk Support includes Zoho Desk, Tidio Helpdesk, Deskero, Support Hub, HelpDesk, Desky, Help Scout, Salesforce Service Cloud, ReadyDesk, Sitehelpdesk, HESK and BoldDesk.