Yes, both ProProfs Knowledge Base and HelpHub offer a Free Trial.
ProProfs Knowledge Base is designed for Large Enterprises, Medium Business and Small Business.
HelpHub is designed for Medium Business and Small Business.
Pricing for ProProfs Knowledge Base Starts at $0.30/Month when Billed Yearly whereas for HelpHub Starts at $39/Month when Billed Yearly.
Some top alternatives to ProProfs Knowledge Base includes KBPublisher, SmartSupport, Talisma KnowledgeBase, HelpHub, KnowledgeOwl, Qualified, Workvivo, PaceKB, KnowledgeBase, Whatis, IFTTT and StructHub.
Some top alternatives to HelpHub includes Zendesk Support, Zoho Desk, Tidio Helpdesk, Freshservice, Freshdesk, Teamwork Desk, Support Hub, Motadata HelpDesk, HelpDesk, SysAid, Jitbit Helpdesk, Desky, LabiDesk, HESK, Helpjuice and KnowledgeBase.