Yes, both KnowledgeBase and ProProfs Knowledge Base offer a Free Trial.
KnowledgeBase is designed for Large Enterprises, Medium Business and Small Business.
ProProfs Knowledge Base is designed for Large Enterprises, Medium Business and Small Business.
Pricing for KnowledgeBase Starts at $59/Month whereas for ProProfs Knowledge Base Starts at $0.30/Month when Billed Yearly.
Some top alternatives to KnowledgeBase includes KBPublisher, SmartSupport, KnowledgeBase Manager Pro, Omnistar Kbase, Talisma KnowledgeBase, IntelligenceBank KM, Helpjuice, KnowledgeOwl, Qualified, Workvivo, PaceKB and ProProfs Knowledge Base.
Some top alternatives to ProProfs Knowledge Base includes KBPublisher, SmartSupport, Talisma KnowledgeBase, HelpHub, KnowledgeOwl, Qualified, Workvivo, PaceKB, KnowledgeBase, Whatis, IFTTT and StructHub.