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RAG & Knowledge Systems

Leann

An open-source Python vector database and retrieval-augmented generation system for indexing and searching personal data locally.

Independent OpenViST project profile, based on linked sources.

Leann — OpenViST project profile in RAG & Knowledge Systems.
OpenViST project illustration. See the linked sources for product details.
Understand the project

Practical overview

When it fits

Use it when retrieval should run on a personal device and the project benefits from compact vector indexes, local processing and integrations with the listed AI ecosystems.

Who it is for

  • People building private local AI assistants
  • Developers creating personal-document search and question-answering tools
  • Users who need an offline-first knowledge base on a laptop
  • Developers adding semantic retrieval to code or MCP workflows

Documented uses

  • Index personal documents and other local data
  • Search files, notes, archives or code semantically
  • Build a local RAG assistant
  • Reduce vector-index storage requirements
  • Provide semantic retrieval to a coding-agent workflow
Before you choose

Requirements & limits

The repository is public and lists an MIT license. Supported platforms in the technical profile are Windows, Linux, macOS and self-hosted environments.

  • Local execution is central to the project’s documented privacy and offline-first positioning.
  • The repository reports 97% storage savings and describes graph-based selective recomputation rather than storing all embeddings.
  • The project is Python-based and references compatibility or integrations involving FAISS, LangChain, LlamaIndex, Ollama and MCP.
  • The repository documents use across files, email, browser history, chat history, agent memory, live data and codebases.
  • Reported benchmark outcomes depend on the tested dataset, task and retrieval setup.

Check current requirements in the official documentation. Source-based guidance does not mean OpenViST has run or independently tested this project.

COMPARE OPTIONS

Compare options for Retrieval-augmented applications

These projects document a common task and share a project role. This is a source-based comparison, not an execution benchmark or a guarantee of interchangeability.

ProjectDocumented purposePlatformAccess and requirements
LeannIndex personal documents and other local dataLinux, macOS, Self-hosted, WindowsThe repository is public and lists an MIT license. Supported platforms in the technical profile are Windows, Linux, macOS and self-hosted environments.
LangsearchCrawl website or local data for a knowledge base.CLI, Self-hosted, Server
Hybrid Search RagCombine document retrieval and language-model generation in a configurable workflow.
Evidence and transparency

Sources & review

Official repository ↗
Source record details
Source availability
Active
Sources checked
30 September 2026
Original website title
StarTrail-org/LEANN · Official homepage title · retained in its source language
How we review sourcesSuggest a correction