Code smarter. Write faster.
Muije is a notebook that fuses a professional code editor with the clarity of a great writing tool — lightweight and native, running right on your machine, not in a browser tab.
Download for macOSCode like you're in VS Code. Think like you're in Notion.
Every code cell has a real language server behind it — completions, go-to-definition, inline diagnostics. Every markdown cell is a rich text canvas with formatting shortcuts, callouts, and collapsible sections.
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import pandas as pd2
import matplotlib.pyplot as plt3
birds = pd.read_csv('birds.csv')4
birds['MaxBodyMass'].plot()5
plt.show()Code editing that feels right
Syntax highlighting, LSP-powered completions, and inline diagnostics. Editing code in a cell should feel as good as editing it in VS Code — so it does.
Writing that flows
Markdown cells feel like a real writing tool. Slash commands, clean typography, callouts, and a reading view that's actually pleasant to read.
What's inside
Everything a notebook should have done all along.
< 20 MB
Small footprint
Environment management
Switch kernels, pick a conda or venv environment, and inspect running processes — all from inside the notebook, without touching a terminal.
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Command shortcuts
A fast command palette and fully remappable shortcuts keep your hands on the keyboard.
Widgets support
Render interactive outputs — sliders, dropdowns, plots — directly in the notebook. Powered by the standard ipywidgets protocol.
Language-agnostic kernels
Built on Jupyter, so any kernel feels native in the same notebook.
Python
Fast where it counts
Muije runs entirely on your machine — quick to launch, light to run, and ready for any language you throw at it.
- Switch environments from a dropdown
- Install packages without leaving the notebook
- Write docs with a real prose editor
- A language server in every code cell
- A native app with a tiny footprint
Why it's different
Everything you need, already in the notebook.
No more switching windows, hunting for the right command, or keeping a terminal open on the side. The tools you reach for are right where the work is.
The usual way
With Muije
Manage environments in a terminal
pip install, conda activate, deactivate — all outside the notebook, easy to lose track of which env is actually running.
Switch environments from a dropdown
Pick a kernel or environment inline. See exactly what’s running. No terminal required.
Install packages in a separate window
Interrupt your flow to run pip, then restart the kernel and hope nothing breaks.
Install packages without leaving the notebook
A built-in package manager handles installs inline, and you still get a full terminal right in the notebook whenever you need one.
Write docs in a basic text area
No formatting shortcuts, no visual hierarchy. Raw markdown syntax and nothing else.
Write docs with a real prose editor
Formatting as you type, slash commands, and callout blocks with a clean reading view.
Code without completions or diagnostics
Basic coloring, no autocomplete, no inline errors. Typos surface only when you run the cell.
A language server in every code cell
Completions, go-to-definition, and inline error highlighting — full IDE tooling, per cell.
Run inside a browser tab
Competes for memory with every other open tab. One crash can mean unsaved work.
A native app with a tiny footprint
Under 20 MB installer, low idle memory. Your files always saved to disk — not a browser session.
Open a notebook. You'll see what we mean.
Free download. No account. Runs on your machine.
< 20 MB bundleNo account requiredWorks fully offline