Callisto: Jupyter & Python IDE

Sebastian Pichler

In-app purchases

About this app

Callisto is a Jupyter Notebook editor and Python IDE for Android. Open .ipynb files, edit cells, run Python code, see output — no server, no cloud account, no internet required.

Built for data scientists, students, and ML/AI practitioners who want a real Python environment in their pocket.

JUPYTER NOTEBOOKS
• Open and edit .ipynb files (v4 format)
• Create new notebooks from scratch
• Run cells individually, run below, or run all at once
• Interrupt long-running cells without losing your session
• Code cells with syntax highlighting (CodeMirror 6)
• Markdown cells rendered with LaTeX math support (KaTeX)
• Cell operations: insert, delete, duplicate, move, change type

PYTHON SCRIPTS
• Edit and run .py files with the same editor and output pipeline
• Unified file library for notebooks and scripts, with recents

INTERACTIVE PYTHON CONSOLE
• Built-in REPL sharing the interpreter with your open file
• Variables and imports flow both ways between console and notebook
• 200-entry persistent input history

SMART CODE COMPLETION
• Jedi-powered autocomplete against your live Python namespace
• df. resolves to actual DataFrame methods — not static stubs
• Signature hints and inline documentation panel

REAL PYTHON, FULLY OFFLINE
• CPython 3.10 runs entirely on-device — no server, no Wi-Fi needed
• Bundled free tier: numpy, matplotlib, Pillow
• "Open with…" — set Callisto as your default .ipynb and .py handler

PRO — FULL SCIENCE BUNDLE
One-time purchase. No subscription, no recurring fees.
Unlock the complete curated package set and extra features:
- pandas, scikit-learn, scipy, statsmodels, seaborn, sympy, openpyxl, beautifulsoup4, requests
- coding keyboard with quick access to the most used programming symbols

MORE
• Dark and light themes with multiple accent colors
• Per-file workspace: output files, data files, ZIP bundle export
• Plot output with pinch-to-zoom
• Privacy-first: no ads, analytics opt-in only

What’s new

• Coding keyboard: new arrow keys to move the cursor precisely, hold to repeat. Pick which keys the bar shows in "Settings" → "Customize coding keyboard"
• Notebooks stay loaded when you switch tabs — returning from the Console or Settings is now instant
• Better RAM management on lower end devices
• Tablets: landscape layout gets a side navigation rail for better use of wide screens
• Stability: app now recovers automatically if Android kills the WebView renderer instead of crashing