Supernotes

Supernotes organizes knowledge into 'cards' instead of pages, which can be nested, tagged, and linked. It has a social layer allowing you to follow other users and share cards publicly or collaboratively. It's fast, web-first, and focuses on atomic ideas. It's ideal for learners and creators who want to build a public or shared knowledge garden.

It has a free tier and subscription. It scores for its unique card-based, socially-oriented approach that encourages sharing and connecting ideas beyond private silos.