Tana

Tana is a next-generation knowledge management tool designed for power users who want the expressiveness of a database, the flexibility of a note-taking app, and the intelligence of AI, all within a single, node-based workspace. Still in active development and with a growing community of early adopters, Tana has built a passionate following among researchers, writers, and knowledge workers who want deeper capabilities than mainstream tools provide.

The fundamental data model in Tana is the node. Every piece of content, from a single sentence to a complex structured record, is a node. Nodes can contain text, other nodes (creating hierarchy), inline nodes (creating inline references), and supertags (typed attributes). This uniform model provides extraordinary flexibility, as the same primitive handles everything from simple notes to complex databases.

Supertags are Tana's most distinctive and powerful feature. A supertag is a reusable type definition that can be applied to any node, transforming it into a structured record with typed fields. Creating a supertag for a Book entity adds fields like Author, Published Date, Status, and Notes. Any node can be tagged as a Book to give it these fields. Multiple supertags can be applied to the same node, enabling flexible multi-typed classification.

The search and query capabilities in Tana are sophisticated and real-time. Search nodes can be configured with filters, field constraints, and supertag requirements that dynamically gather all matching nodes from anywhere in the workspace into a single view. This query-based aggregation enables creating personal databases that surface relevant information from scattered notes automatically.

AI integration in Tana goes beyond simple text generation. AI commands can query the workspace content, reason over connected nodes, extract structured information from unstructured text, and generate content informed by existing knowledge base content. This integration makes Tana particularly powerful for researchers and analysts who want AI to help synthesize and act on their personal knowledge base.

The daily note workflow provides a daily log page that serves as a capture point for new information, tasks, and observations, with Tana's bidirectional linking ensuring that content captured in daily notes is automatically connected to relevant topic nodes.