Yes, both SeamlessDesk and HelpDesk offer a Free Trial.
SeamlessDesk is designed for Medium Business and Small Business.
HelpDesk is designed for Large Enterprises, Medium Business and Small Business.
Pricing for SeamlessDesk Starts at $57/Month whereas for HelpDesk Starts at $29/User/Month when Billed Yearly.
Some top alternatives to SeamlessDesk includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Freshdesk, Deskero, LiveAgent, HelpDesk, SysAid, Jitbit Helpdesk, ReadyDesk, Sitehelpdesk, HESK, Help Desk Premier, DeskXpand and Scopedesk.
Some top alternatives to HelpDesk includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Freshdesk, SupportBee, Teamwork Desk, SysAid, Jitbit Helpdesk, Snappy, Helpspot, ReadyDesk, HelpdeskEddy, Help Desk Premier, Support.cc by 500apps and BoldDesk.