Juno
Juno is a native Python development environment for iPad and iPhone.
What Juno is
Juno is a native Python development environment for iPad and iPhone. It runs Python scripts and Jupyter notebooks locally with a built-in Python 3.13 interpreter, including offline work. Projects can use notebooks, standalone scripts, folders, and interactive REPL sessions. More than 130 packages are included, such as NumPy, SciPy, pandas, Scikit-learn, Polars, and DuckDB. Its package manager installs most pure-Python packages from PyPI, although compiled-extension packages may require app bundling. An optional AI assistant answers questions, generates code, and applies reviewed changes using your own API key with OpenAI, Anthropic, or Google Gemini. Juno supports Apple Files, Dark Mode, Dynamic Type, split screen, multiple windows, and Magic Keyboard and trackpad. Workspace data stays local; there are no accounts or cloud storage. Juno Pro is a one-time purchase with price not listed.
Good
- Runs Python and Jupyter locally offline
- Includes over 130 pre-installed Python packages
- Supports scripts, notebooks, projects, and REPL
- Optional AI assistant applies reviewed code changes
- Workspace data stored locally without cloud storage
Watch out
- iOS only
- Compiled-extension packages may not install
- No multiple environments or arbitrary notebook extensions
- Cannot install another Jupyter kernel
Who it suits
It suits Python users who want local development and notebooks on iPad or iPhone. It is also useful for developers needing iOS file integration and optional AI coding assistance.
Verdict
Juno provides a substantial local Python workspace for Apple mobile devices, with notebooks, package support, and optional AI coding help. Its platform and environment limitations matter for projects requiring broader kernel or extension flexibility.
Plans and prices
From Juno's own pricing page, checked 5 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Juno Pro | — | Unlocks continued code execution after free trial; no subscription · One-time purchase; price not stated on the opened page |
The facts
Each one read from Juno's own pages, with the date it was checked.
What it does
- AI assistant
- The optional AI coding assistant can answer questions, generate code and apply reviewed changes across notebooks, scripts and projects.checked 5 Oct 2026
- AI providers
- The AI assistant uses the user’s own API key and sends requests directly from the device to OpenAI, Anthropic or Google Gemini.checked 5 Oct 2026
- Git workflow
- Juno works with third-party git clients such as Working Copy by editing repository files in place through iOS file system access.checked 5 Oct 2026
- Known limits
- Juno does not support multiple environments or arbitrary notebook extensions, and cannot install another Jupyter kernel.checked 5 Oct 2026
- Libraries
- Juno includes over 130 pre-installed Python packages, including NumPy, SciPy, pandas, Scikit-learn, Polars and DuckDB.checked 5 Oct 2026
- Notebooks and projects
- Juno supports Jupyter notebooks, standalone Python scripts, project folders and interactive REPL sessions.checked 5 Oct 2026
- Offline use
- Local development works offline using Juno’s built-in Python 3.13 interpreter.checked 5 Oct 2026
- Package installation
- Its package manager installs most pure-Python packages from PyPI, but packages that depend on compiled extensions may not be installable unless bundled with the app.checked 5 Oct 2026
- Security and privacy
- Juno stores workspace data locally, does not provide accounts or cloud storage, and does not itself upload notebooks, scripts or projects to Rational Matter.checked 5 Oct 2026
- Support
- The FAQ directs users to documentation, the GitHub issue tracker or email for help.checked 5 Oct 2026
- Telemetry
- The standard edition sends product usage events to TelemetryDeck and Firebase Analytics and uses Firebase Crashlytics for crash reports.checked 5 Oct 2026
- What it does
- Juno is a native Python development environment for iPad and iPhone that runs Python scripts and Jupyter notebooks locally on the device.checked 5 Oct 2026
The company
- Headquarters
- London, United Kingdomchecked 28 Sep 2026
- Maker and location
- The privacy policy identifies Rational Matter Ltd as the controller and lists its address as 71–75 Shelton Street, London WC2H 9JQ, United Kingdom.checked 5 Oct 2026
Where it runs
- iOS integration
- Juno integrates with Apple Files and supports Dark Mode, Dynamic Type, split screen, multiple windows and Magic Keyboard and trackpad.checked 5 Oct 2026
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