PageIndex Flash — fast, open-source tree indexing for long, text-based PDFs
What is PageIndex?
PageIndex is a vectorless, reasoning-based RAG engine that mirrors how humans read, delivering traceable, explainable, and context-aware retrieval, with no vector DBs or chunking. It works in two steps:
- Index — generate a tree-structure index for each document.
- Retrieve — agentically search that tree with LLM reasoning.
To learn more about PageIndex, please see our detailed introduction to the PageIndex framework .
PageIndex Workflow: Tree index generation; and agentic LLM reasoning over the index for context-aware retrieval
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Try PageIndex App
Analyze and chat with your documents, directly in your browser
Enterprise
Dedicated cluster, or private deployment in your VPC for organizations
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