Yes, both Notabase and NoteStack offer a Free Trial.
Notabase is designed for Large Enterprises, Medium Business and Small Business.
NoteStack is designed for Freelancers, Medium Business and Small Business.
Pricing for Notabase Starts at $5.83/Month when Billed Yearly whereas for NoteStack Starts at $7/Month.
Some top alternatives to Notabase includes Evernote, Notes.io, RemNote, UpNote, Notability, NoteStack, Spake, WebFolder and Obsidian.
Some top alternatives to NoteStack includes Evernote, Brainio, Amanote, Notes.io, Triqla, Microsoft OneNote, Notability, Einote and Note-Smart.