Juno – Python and Jupyter 4+

Coding with Python and Jupyter

Rational Matter

    • Free
    • Offers In-App Purchases



Zero-setup Python environment and developer toolbox in a first-class citizen app for iPad and iPhone.

Juno is designed to cover all your Python coding needs, and will work seamlessly with all source code formats. Juno supports both Python scripts (.py) and Jupyter notebooks (.ipynb) — a document format focused on applying Python to data analysis and computational science.


- Navigate and manage files and folders, quickly preview documents and media
- Browse and view Jupyter notebooks with quick and beautifully rendered previews
- Navigate through code sources, scripts, JSON, XML, and other text-based formats with rich previews and syntax highlighting
- Add quick access bookmarks for file system locations outside the app's sandbox, or simply open documents in place


- Run code in Jupyter notebooks and Python sources locally on your device with a built-in Python 3.10 interpreter, entirely offline
- Write and execute Python code in a full-fledged development environment, featuring snappy, intelligent code completion and a console with full terminal emulator support
- Access all Jupyter features in a modern, powerful and customizable notebook editor
- Leverage powerful data analysis, machine learning and developer tools: NumPy, Matplotlib, SciPy, Scikit-learn, Pandas, LXML, and more
- View and edit any file as text in a built-in versatile plain text editor with syntax highlighting
- Enjoy painless package management: easily install any pure Python package with an intuitive package manager


Python scripts are plain-text Python source code files with a .py extension. Juno lets you work on these with snappy code completion, a console with full terminal emulator support, a built-in media viewer for code-generated images, plots, web apps, and more. Juno will execute the code using an embedded Python interpreter, locally on your iPhone or iPad and completely offline.


A Jupyter notebook is a versatile document format that enables you to store live code, markdown text, plots, images, and LaTeX equations — all within a single notebook file with a .ipynb extension. Notebooks serve as excellent Python coding playgrounds for data manipulation and experimentation, and Juno makes working with them a breeze!

Notebook documents keep a record of all inputs and outputs from an interactive programming session, and the rich output generated by running Python scripts (including HTML, images, video, and plots) is embedded within the Jupyter notebook document. They are particularly convenient for coding in Python for data analysis, machine learning, or computational science in general.

What’s New

Version 3.1.0

What's new in 3.1:

- Adds pytables, numexpr and peewee.
- Resolves dependencies for upgrading yfinance.
- Fixes notebook JSON getting minified on save.
- Fixes the app crashing in some cases after restoring device from backup.
- Fixes several crashes in Python runtime and lxml.
- Fixes a couple of minor UI issues.

Ratings and Reviews

4.8 out of 5
830 Ratings

830 Ratings

Wald76 ,

A powerful tool for iOS

My main Jupyter environment is Anaconda on my Mac. I use GitHub to sync about 30 notebooks and their associated Python source files over to Juno (both on my iPad and on my iPhone) so I can give impromptu demos and make small changes and improvements no matter where I am. Over time Juno has matured and grown fairly robust. I’m especially glad that Python 3.10 support came out in May 2023.

Alex Staravoitau responded quickly when I reported a configuration glitch in the new Python 3.10 release (the Bokeh plotting library required a different version of jinja2). He gave me a temporary workaround and within a couple of days got a corrected version out to the App Store.

Juno is probably my most favorite app. It’s been extraordinarily useful. A strong five stars!

CookieElle ,

Work likes Jupyter Notebook; makes it easy to use Python on the iPad

I am a Bioinformatician and I use Jupyter Notebook and Python as part of my workflow. Every now and then I like to take a break from using my computer, and simply use my iPad Pro to write Python scripts. I really like this app as it suits this purpose. Juno works like Jupyter Notebook, with the markdown style, python console, and even the functional keys of “B”, “A”, “M”, when adding a new line below, above, and markdown that makes Jupyter Notebook easy to use.

I haven’t had any issues with delays, crashes, or bugs. It works great, and to take things a step further, I would really like to see R included as a language for this app. There is definitely a need for it.

Brandon M. Tseng ,

When are you going to update the Python latest version!!!etc….Requesting New features

We need this *advanced New features*!!! When are you going to update the Python version (Python 3.10.0/Python 3.9.9), add new programming languages such as R, Julia, C++, JavaScript, C#, Swift and more programming languages, update the latest Python3 frameworks/libraries, add Tensorflow, add Keras, add PyTorch and integrate Kaggle deep learning and integrate GitHub. Dev(s) we need this advanced features if you want this “Juno” app to be called a “pro ml/data science” app

App Privacy

The developer, Rational Matter, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Usage Data
  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Some in‑app purchases, including subscriptions, may be shareable with your family group when Family Sharing is enabled.

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