AI product Open source · MIT
PageIndex is a vectorless, reasoning-based retrieval-augmented generation platform from VectifyAI. It replaces vector indexes and chunking with a hierarchical tree index for each document, then uses an LLM to search that tree agentically, following document structure and context to retrieve relevant sections with traceable references.
The PageIndex SDK supports local indexing, retrieval, and chat with a user's own LLM key, as well as PageIndex Cloud for managed parsing, OCR, image understanding, tree-index construction, and storage. It can process text-based PDFs locally and supports cloud-hosted indexes for scanned and image-rich documents; the platform also provides an application for long professional documents, an agent integration interface, and a cloud-only file-level tree index for reasoning across document collections.