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Juno
London, United Kingdom
What it is
Juno is a native Python development environment for iPad and iPhone that runs scripts and Jupyter notebooks locally. Its built-in Python 3.13 interpreter supports offline development. Users can work with notebooks, standalone scripts, project folders and interactive REPL sessions. Juno includes more than 130 pre-installed packages, including NumPy, SciPy, pandas, Scikit-learn, Polars and DuckDB. Its package manager installs most pure-Python packages from PyPI, while packages requiring compiled extensions may not install unless bundled with the app. An optional AI coding assistant can answer questions, generate code and apply reviewed changes across notebooks, scripts and projects. It uses the user’s API key and sends requests directly from the device to OpenAI, Anthropic or Google Gemini. Juno integrates with Apple Files and supports Dark Mode, Dynamic Type, split screen, multiple windows, Magic Keyboard and trackpad. Workspace data stays locally, and Juno does not provide accounts or cloud storage. The standard edition sends product usage events to TelemetryDeck and Firebase Analytics and uses Firebase Crashlytics for crash reports. Known limits include no multiple environments, arbitrary notebook extensions or additional Jupyter kernels.
For and against
For
- Runs offline with a built-in Python 3.13 interpreter.
- Includes over 130 Python packages.
- Supports notebooks, scripts, projects and REPL sessions.
- Workspace data is stored locally.
Against
- Some packages with compiled extensions may not install.
- No multiple environments or arbitrary notebook extensions.
- Cannot install another Jupyter kernel.
- No cloud storage or accounts.
The verdict
Juno combines local Python execution with notebooks, scripts and a substantial set of pre-installed packages on iOS. Its package and kernel limits are important for workflows that depend on compiled libraries or Jupyter extensions.
Who it suits
Juno may suit iPad and iPhone users who want to run Python scripts or notebooks locally, including offline. Its included packages and optional AI assistant may be useful for mobile development workflows.
Plans and prices
Juno Pro
Unlocks continued code execution after free trial; no subscription
Read 5 Oct 2026 · juno.sh
On the record
- AI assistant
- The optional AI coding assistant can answer questions, generate code and apply reviewed changes across notebooks, scripts and projects.juno.sh · read 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.juno.sh · read 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.juno.sh · read 5 Oct 2026
- iOS integration
- Juno integrates with Apple Files and supports Dark Mode, Dynamic Type, split screen, multiple windows and Magic Keyboard and trackpad.juno.sh · read 5 Oct 2026
- Known limits
- Juno does not support multiple environments or arbitrary notebook extensions, and cannot install another Jupyter kernel.juno.sh · read 5 Oct 2026
- Libraries
- Juno includes over 130 pre-installed Python packages, including NumPy, SciPy, pandas, Scikit-learn, Polars and DuckDB.juno.sh · read 5 Oct 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.juno.sh · read 5 Oct 2026
- Notebooks and projects
- Juno supports Jupyter notebooks, standalone Python scripts, project folders and interactive REPL sessions.juno.sh · read 5 Oct 2026
- Offline use
- Local development works offline using Juno’s built-in Python 3.13 interpreter.juno.sh · read 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.juno.sh · read 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.juno.sh · read 5 Oct 2026
- Support
- The FAQ directs users to documentation, the GitHub issue tracker or email for help.juno.sh · read 5 Oct 2026
- Telemetry
- The standard edition sends product usage events to TelemetryDeck and Firebase Analytics and uses Firebase Crashlytics for crash reports.juno.sh · read 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.juno.sh · read 5 Oct 2026
