Yes, both Zendesk Support and ioni offer a Free Trial.
Zendesk Support is designed for Large Enterprises, Medium Business and Small Business.
ioni is designed for Large Enterprises, Small Business, Medium Business and Individuals.
The starting price of Zendesk Support begins at $19/user/month when yearly, while pricing details for ioni are unavailable.
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.
Some top alternatives to ioni includes and undefined.