Yes, both NoteStack and Notion offer a Free Trial.
NoteStack is designed for Freelancers, Medium Business and Small Business.
Notion is designed for Individuals, Freelancers, Medium Business and Small Business.
Pricing for NoteStack Starts at $7/Month whereas for Notion Starts at $4/Month when Billed Yearly.
Some top alternatives to NoteStack includes Evernote, Brainio, Amanote, Notes.io, Triqla, Microsoft OneNote, Notability, Einote and Note-Smart.
Some top alternatives to Notion includes Jira, Knote, Trello, Confluence, Asana, Easynote, ClickUp, TWiki, MeisterNote and Zenkit Hypernotes.