How do I save my first item?

Paste any YouTube URL, article, or PDF into the capture bar. BrainTube extracts the transcript, generates a summary, and indexes everything within a minute.

How do I connect BrainTube to Claude or Cursor?

Open /connect in the app to get your MCP URL and API key, then paste it into Claude Desktop's config or Cursor's MCP settings. Your library becomes a tool the AI can call.

A Brain is a focused group of items you can chat with. Dashboard → Brains → New, pick items, give it a name. You can keep it private or share it publicly via a slug.

How does billing work?

Plans run monthly or annually with a 7-day trial. BrainTokens cover AI usage on top of your plan. Refunds within 14 days, no questions asked.

Where is my data stored?

EU-region infrastructure. You own your data, you can export it as JSON anytime, and account deletion purges backups within 30 days.

Knowledge Graph and Connections — Help

BrainTube builds a Knowledge Graph — a network of relationships between your saved content, entities, and concepts.

How Connections Form

Automatic Discovery

The auto-linker creates edges based on shared entities (2+ shared trigger a connection), semantic similarity (>85%), and co-mention patterns.

Relationship Types

The graph supports 22 edge types including related_to, builds_on, contradicts, reinforces, and synonym_of.

Exploring the Graph

Knowledge Map

Visit Knowledge Boxes to see a visual map of how your content connects.

Item Connections

On any item's detail page, scroll to "Related Content" to see connected items.

Graph-Enhanced Search

Search traverses the graph to discover contextually related items beyond keyword matches.

Graph Health

Orphan rate — Goal: <25% items with no connections
Edge density — Average connections per item
Community detection — Clusters of densely connected items become Second Brains

Personalized PageRank

BrainTube uses Personalized PageRank (inspired by HippoRAG) to discover multi-hop connections — finding items connected through chains of relationships.