SaturnoLab

SaturnoLab (saturnolab) is a fast, lightweight, .ipynb-compatible Python notebook environment built from the ground up with Inline AI (Ctrl+I / Ctrl+K) connected directly to live Python kernel memory.

Features

• 100% .ipynb Compatible: Open, edit, execute, and save standard Jupyter notebooks (nbformat v4).
• Zero-bloat Web UI: Built with React, CodeMirror 6, and FastAPI (~305 KB gzipped) with 6 technical themes (Graphite, Obsidian, Gruvbox, Nord, Jupyter Light, Warm Stone).
• Inline Cell AI (Ctrl+I / Ctrl+K):
  • Generate or edit Python code directly inside any cell or over a selected snippet.
  • Automatically injects live kernel variable schemas (DataFrame shapes, column names, dtypes, array dimensions) and preceding cell context into the prompt.
  • Instant Tab to accept, Shift+Tab to toggle Replace vs Append, and Ctrl+Enter to accept & execute immediately.
• Multi-Provider LLM Support:
  • Google Gemini API (gemini-2.5-flash, gemini-2.5-pro, etc.)
  • OpenAI Codex CLI / SDK (@openai/codex)
  • OpenAI-compatible APIs (OpenAI, local Ollama, OpenRouter, LM Studio)
  • Anthropic Claude API
• Automatic Virtualenv Detection: Automatically detects .venv / venv / $VIRTUAL_ENV in the target project folder.

Installation

pip install saturnolab

# Optional: include common data science stack (pandas, numpy, matplotlib, seaborn)
pip install "saturnolab[data]"

Or install globally as an isolated CLI tool with uv:

uv tool install saturnolab

Usage

Run saturnolab inside any project directory, just like jupyter lab:

# Open in the current directory
saturnolab

# Or point to any folder
saturnolab /path/to/project

# Custom port or headless server mode
saturnolab --port 8900 --no-browser

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