Download Lucy
The desktop app runs the full Lucy server right on your machine — local-first, offline-capable, and connected to every AI provider. Free and open source.
Free & open source · All versions & release notes →
Local-first by default
Your chats, memory, and provider keys stay on your machine. No account needed to start.
Works offline
Run local models with Ollama or LM Studio — no internet, no API keys required.
Every provider
Bring your own key for OpenAI, Claude, Gemini, Mistral, Groq, DeepSeek and more.
Sync when you want
Optionally connect a justlucy.ai account to back up and sync across your devices.
System requirements
- • Windows 10 or 11 (64-bit) — NSIS installer.
- • macOS 12 Monterey or later (Apple Silicon & Intel).
- • Linux — AppImage, runs on most distributions.
macOS and Linux builds aren't notarized yet — allow the app in Gatekeeper, or mark the AppImage executable, to run it. First launch opens a quick setup so you can pick a cloud key or a local model.