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leon-ai/leon

Leon is an open-source personal AI assistant that runs locally and can use tools, memory and context to complete tasks.

Open-source alternative to:SiriAlexa

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What is it?

Leon is a personal AI assistant built around tools, context, memory, and agentic execution. It can run in three modes: smart chooses the approach automatically, controlled follows deterministic native skills and actions, and agent plans step by step. Instead of replying only with text, it calls real tools to get work done.

Leon keeps layered memory covering durable preferences, day-to-day context, and recent conversation, and it can use information about the machine and setup it runs on. It supports both local and remote AI providers, so users can trade off privacy, control, and capability. Its computer use feature can operate desktop and browser interfaces and verify visual outcomes.

The project is in a 2.0 Developer Preview on the develop branch, with a Node.js >= 24 requirement and support for Linux, macOS, and Windows. The older, more stable pre-agentic version lives on the master branch. Built-in skills cover search, productivity, system utilities, media, coding help, and voice features.

Key features

  • 01Runs locally by default and can connect to local or remote AI providers.
  • 02Offers smart, controlled, and agent execution modes.
  • 03Calls real tools and native or SKILL.md-based agent skills to complete tasks.
  • 04Keeps layered memory of preferences, daily context, and recent discussion.
  • 05Provides computer use for desktop and browser interfaces.

Use cases

  • Building a privacy-focused personal assistant that works with local models.
  • Automating everyday tasks such as search, productivity, and system utilities.
  • Experimenting with agent-style tool use and memory on your own machine.
  • Extending an assistant with custom skills and toolkits.

Quick start

  1. 1

    Clone the repository

    git clone https://github.com/leon-ai/leon.git
  2. 2

    Go to the project root

    cd leon
  3. 3

    Install pnpm and dependencies

    npm install --global pnpm@latest && pnpm install
  4. 4

    Run Leon (app at http://localhost:5366)

    pnpm start

Things to know

  • Requires Node.js 24.0.0 or newer.
  • The 2.0 Developer Preview is in progress, the new documentation is not ready, and the docs site may lag behind the code.

Topics

#ai-assistant#ai-agent#personal-assistant#voice-assistant#automation#privacy#nodejs#typescript#ai#artificial-intelligence

FAQ

What is leon?
Leon is an open-source personal AI assistant that runs locally and can use tools, memory and context to complete tasks. Leon is a personal AI assistant built around tools, context, memory, and agentic execution. It can run in three modes: smart chooses the approach automatically, controlled follows deterministic native skills and actions, and agent plans step by step. Instead of replying only with text, it calls real tools to get work done.
Is leon free to use? What license does it have?
leon is open source under the MIT license. Check the license terms before using it in commercial products.
Is leon still maintained?
Actively maintained. The last commit to leon was on Oct 20, 2026.
What can I use leon for?
Building a privacy-focused personal assistant that works with local models. Automating everyday tasks such as search, productivity, and system utilities. Experimenting with agent-style tool use and memory on your own machine. Extending an assistant with custom skills and toolkits.
How do I install leon?
Clone the repository: git clone https://github.com/leon-ai/leon.git Go to the project root: cd leon Install pnpm and dependencies: npm install --global pnpm@latest && pnpm install Run Leon (app at http://localhost:5366): pnpm start
Where can I get leon?
The source code and installation instructions are on GitHub: https://github.com/leon-ai/leon

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