Yes, both HelpKit and Notion offer a Free Trial.
HelpKit is designed for Large Enterprises, Medium Business and Small Business.
Notion is designed for Individuals, Freelancers, Medium Business and Small Business.
Pricing for HelpKit Starts at $15/Month when Billed Yearly whereas for Notion Starts at $4/Month when Billed Yearly.
Some top alternatives to HelpKit includes Notion, SmartSupport, FromNotion, HelpHub, Qualified, Workvivo, KnowledgeBase, Answerly, ClickHelp and IFTTT.
Some top alternatives to Notion includes Jira, Knote, Trello, Confluence, Asana, Easynote, ClickUp, TWiki, MeisterNote and Zenkit Hypernotes.