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Yes, both Salesforce Service Cloud and Portal offer a Free Trial.
Salesforce Service Cloud is designed for Large Enterprises, Medium Business and Small Business.
Portal is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Salesforce Service Cloud Starts at $25/user/month when yearly whereas for Portal Starts at $10/Month.
Some top alternatives to Salesforce Service Cloud includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Freshdesk, LiveAgent, HelpDesk, SysAid, Jitbit Helpdesk, HubSpot Service Hub, Help Scout, UseDesk, LabiDesk, AzureDesk, HESK and BoldDesk.
Some top alternatives to Portal includes Etlworks Integrator, Stitch, Matillion ETL, Fivetran, Blendo, Panoply, Actian DataConnect, ETLrobot, Conduit and People to Notion.