Tana, founded in 2020, extends a live outliner note-taking interface with a specific mechanism called supertags: tagging a line of text with a supertag instantly gives it structured fields and properties, turning what would be a plain freeform note in most outliners into database-like, queryable data without switching to a separate database tool.
That supertag system lets a single note function as both a freeform thought and a structured record simultaneously: a line tagged as a "person" supertag gains fields like role or company automatically, while remaining part of the same flowing outline rather than living in a rigid, separate table a user has to context-switch to.
A free tier covers standard use, and paid plans start around $5 a month for more features. For a power user who wants freeform outlining and structured, queryable data in the exact same note without switching between separate tools, Tana's supertag mechanism addresses that specific combination directly.
