Tana is a new-generation structured AI note-taking and knowledge management tool from San Francisco, launched in beta in 2023, built around Supertags and Tana AI. It offers a free plan with subscriptions around $10-15/month for structured personal knowledge bases.
Reflect is an AI-powered, end-to-end encrypted notes app combining Daily Notes, bidirectional links, and built-in AI summaries and Q&A at about $10/month, an Obsidian-style choice for privacy-conscious users.
Mem is an AI-first note and knowledge management tool founded by a US team in 2020, fully rebuilt with Mem 2.0 in 2023, supporting auto-organization, Mem Chat, and AI search, a representative product in the AI note-taking space.