Give every color a meaning you define
Standard highlighting treats all colors the same. Highlyt lets you define what each color means per document: yellow for key concepts, blue for questions, green for evidence. When you export or connect AI via MCP, your reasoning travels with the text.
How it works
Three steps to get started
Select text and choose a color
Highlight any passage in your PDF or EPUB. Pick from amber, sky, sage, rose, or any custom color. Each one carries a meaning you define.
Define what each color means
Open the color definitions panel and label each color: key concept, open question, supporting evidence, methodology. Definitions are saved per document.
Export with meaning intact
When you export as JSON or connect Claude via MCP, each highlight includes its color label. Your AI knows this is a framework, not just random text.
Who it's for
Built for how you actually read
Color-code by subject across textbooks
Preparing for GATE or finals? Use yellow for definitions, blue for formulas, green for solved examples. Search 'all green highlights in thermodynamics' across 8 textbooks.
Separate findings from methodology
In a literature review, rose marks methodology, sage marks results, amber marks theoretical frameworks. When you feed 40 papers to Claude, it knows which is which.
Track mental models across books
Yellow for frameworks, blue for questions you want to explore later, green for evidence that supports or contradicts. Across 50 books, your colors become a personal taxonomy.
Frequently asked questions
What is semantic color-coded highlighting?+
Standard highlighting uses colors interchangeably. Semantic highlighting assigns a specific meaning to each color, like yellow for key concepts and blue for questions. You define what each color means, and that meaning is preserved when you export or connect to AI tools.
Can I customize color meanings per document?+
Yes. Each document has its own color definitions. A research paper might use rose for methodology, while a business book might use rose for counterarguments. Click the palette icon in the viewer to edit meanings.
Do the color meanings export with my highlights?+
Yes. JSON export and MCP server both include color definitions alongside each highlight. When Claude reads your highlights, it sees 'key concept' not just 'yellow highlight.'
How many colors can I use?+
Highlyt supports amber, sky, sage, rose, and violet by default. Each can be assigned any meaning you choose. The colors are designed with 0.45 opacity for comfortable long reading sessions.
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.