Yes, both Kustomer and Zendesk Sell offer a Free Trial.
Kustomer is designed for Large Enterprises, Medium Business and Small Business.
Zendesk Sell is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Kustomer Starts at $29/User/Month whereas for Zendesk Sell Starts at $19/User/Month when yearly.
Some top alternatives to Kustomer includes Zoho Desk, Zendesk Support, ManageEngine ServiceDesk Plus, Zendesk Sell, Freshservice, Freshdesk, HelpDesk, SysAid, Jitbit Helpdesk, Desky, Salesforce Service Cloud, CRMdesk, Gorgias, Trakdesk, AzureDesk and BoldDesk.
Some top alternatives to Zendesk Sell includes Pipedrive, Freshsales, Salesflare, Close, Vendasta, Keap, Hubspot Marketing Hub, ClickUp, Zoho CRM, Salesforce, HubSpot CRM, Thryv, Pipeliner CRM, SalesCRM, SimpleCRM, Snapforce CRM, Salesforce Sales Cloud and Pipeline CRM.
