See how your ideas connect across documents
Link any two highlights across pages, chapters, and documents. Label relationships like 'supports,' 'contradicts,' or 'extends.' An interactive visual graph reveals patterns in your reading that linear notes cannot capture.
How it works
Three steps to get started
Link any two highlights
Select two highlights from any documents and choose 'create link.' Label the relationship: supports, contradicts, extends, or any custom label. Links work across pages and across different books.
Watch your graph emerge
An interactive visual graph builds automatically from your links. Nodes are highlights, edges are relationships. Clusters of connected ideas form naturally as you read more.
Feed the graph to AI
When Claude or ChatGPT connects via MCP, it sees your entire graph: which ideas support each other, which contradict, how frameworks relate across books. Your reading structure becomes AI context.
Who it's for
Built for how you actually read
Map concepts across textbooks
The thermodynamics chapter in your physics textbook connects to the entropy discussion in your chemistry book. Link those highlights and see the cross-disciplinary pattern in your graph.
Build a literature map
Paper A's methodology addresses Paper B's limitation. Paper C's findings support Paper A's hypothesis. Your knowledge graph becomes a living literature review that grows with every paper you read.
Connect frameworks across books
The decision-making framework in Thinking, Fast and Slow explains the bias pattern in Predictably Irrational. Link those highlights. After 20 books, your graph reveals how ideas compound.
Frequently asked questions
What is a knowledge graph in a PDF reader?+
A knowledge graph is an interactive visual map of connections between your highlights. Link any two highlights across pages or documents and label the relationship. The graph reveals patterns in your reading that linear notes cannot capture.
Can I link highlights across different documents?+
Yes. Cross-document linking is the core feature. Link a framework from Book A to evidence from Paper B. Ghost nodes with dashed borders show which document each connected highlight comes from.
How is this different from Notion backlinks?+
Notion backlinks connect pages. Highlyt links connect specific passages within documents, with labeled relationships (supports, contradicts, extends). Your graph is built from your actual reading annotations, not from page structure.
Does the graph layout persist?+
Yes. Highlyt saves your graph layout positions so the visual arrangement is preserved between sessions. Rearrange nodes to match your mental model and they stay where you put them.
Can AI access my knowledge graph?+
Yes. The MCP server gives Claude and ChatGPT full access to your graph: nodes (highlights), edges (relationships), labels, and cluster summaries. Ask your AI 'what contradicts the attention hypothesis in my reading?' and it can answer from the graph.
Your next book deserves better than a yellow highlighter
Every book and paper you read builds your knowledge. Highlyt makes sure none of it gets lost. Start your free trial and turn scattered highlights into a connected, searchable, AI-ready knowledge base.