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LEANN

Lets you search and ask questions about your own files, emails and notes, privately on your laptop.

Research-backedNew this week

What it does

LEANN is a vector database, a kind of search index that finds things by meaning rather than exact words. It helps build RAG systems, where an AI answers questions using your own documents.

Its makers say it uses about 97% less storage than usual tools without losing accuracy, because it works out much of the index on demand instead of storing it all. The README says your data never leaves your laptop.

The README shows it searching files, emails and browser history, and it can plug into the coding assistant Claude Code as a smarter search tool.

Who it's for

Developers and technical users who want private AI search over their personal data or code.

Can I use it without coding?

Developers only. It is a Python library installed and used with code or the command line. New to this? Start here.

Can I run it?

Cost
FreeNothing to pay or sign up for.
Runs on
Mac, Linux, Windows
Computer
An ordinary computer is fine
Privacy
Runs on your own device: your data stays with you
API key
Not needed

Try it

Using Claude Code, Cursor or another AI coding assistant? Paste the prompt and it will walk you through the setup.New to this?

Before you install

  • Only download from the official GitHub page. Copies with similar names exist for many popular projects.
  • License (MIT): Very permissive: free to use, change and share, including for business.
  • More on staying safe

Where people are talking about it