Python Editor vs Codecell

Learn Python and try it out – right on your iPhone, iPad and Mac. Python Editor runs your code on the device, with no account and no internet needed. Made for school, college, coding classes and everyone just getting started. RUN PYTHON • Python 3 runs right in the app, also offline • print(), input() and a console like a terminal • Errors with their line number and a hint in plain words about what went wrong • numpy and matplotlib are built in; other packages like pandas, scipy or sympy download on first import DRAWINGS AND CHARTS Watch the turtle draw stars, spirals and houses with the turtle module, just like in computer science class. Charts from matplotlib show up right in the console. JUPYTER NOTEBOOKS Open and write .ipynb files: code cells you run one at a time, with text and output in between. The cells share their variables – just like in Jupyter. 20 EXAMPLES TO START FROM Guess the number, rock paper scissors, prime numbers, a colorful spiral, grades from a CSV file, a quiz from JSON and more. Each example becomes a file of your own to run and change. MADE FOR WRITING CODE • Syntax highlighting and line numbers • Suggestions as you type for Python, math, random, turtle, numpy and more • A bar above the keyboard with Tab, symbols and building blocks like if, for, def and class • Brackets and quotes close themselves, and lines indent after a colon • Find and replace, go to line and keyboard shortcuts WHOLE PROJECTS Every folder is a project with a file list, tabs and search. Your program imports its own modules and reads files like data.csv from its folder. Open folders from the Files app and iCloud Drive right where they are. ALSO FOR MARKDOWN, JSON, CSV, YAML AND TOML With highlighting and a preview for Markdown. ON THE MAC TOO With a menu bar, multiple windows and keyboard shortcuts. PYTHON EDITOR PRO Python, packages, notebooks, examples and everything for learning are free. Pro adds comfort – as a monthly or yearly subscription: • AI assistant with Claude, ChatGPT or Gemini that explains your code and proposes changes • No ads • iCloud sync between iPhone, iPad and Mac • Import ZIP files and folders as projects, share projects as ZIP • Eight designs, from warm paper to deep black midnight • Widgets for the Home Screen and Lock Screen • Version history: bring back any earlier state • App lock with Face ID Payment is charged to your Apple Account. The subscription renews automatically unless canceled at least 24 hours before the end of the current period. You can manage and cancel it anytime in your App Store account settings. The AI assistant uses your own API key from Anthropic, OpenAI or Google; its provider bills requests through it. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://jlau.netlify.app/python-editor/privacy/ Python Editor is built by an independent developer. If you enjoy it, a rating means a lot!

Most code apps stop at "press run, read the output". Codecell starts there and then shows you what your program actually did, one line at a time. ONE LIBRARY, TWO LANGUAGES A script is Python or JavaScript, and both sit in the same library. The same tracer, the same variables inspector, the same REPL and the same assistant work on either one. There is no mode to switch and no second app to buy. REPLAY ANY RUN, WITH BREAKPOINTS Press Trace instead of Run and Codecell records the program as it executes: every line, every call and return, and the value of every variable at each step. Scrub back and forth, play it like a video, and watch a loop go wrong at the exact moment it does. Tap a line number to set a breakpoint; playback runs to it and stops, and Continue jumps to the next one. This is the pen-and-paper trace a teacher draws on a whiteboard, done by the interpreter itself. SEE THE VARIABLES After any run, the Variables tab lists every name your program defined, with its type and value — dicts, lists, objects, functions and classes included. No print statements, no console.log. A REPL THAT REMEMBERS Open the REPL from your script library and an interactive session stays alive between entries: define something, use it in the next one, restart when you want a clean slate. Expressions show their value; history is one tap away. AN ASSISTANT THAT RUNS YOUR CODE On iPhones with Apple Intelligence, the assistant reads the script you are looking at, runs it to see the real output or error, explains what went wrong, and offers a corrected version. Every suggestion is checked for syntax errors before you see it, and nothing is applied until you tap Apply. It uses Apple's on-device model — no account, no API key, and nothing you write leaves the phone. RUN FROM SHORTCUTS Every saved script is a "Run Script" action in the Shortcuts app. Transform text, compute a value, or process the output of another action — offline, with no server. IT ALL WORKS ON A PLANE CPython 3.14 is built into the app and JavaScript runs on the engine iOS already ships. Neither calls out to anything. The Python standard library comes along: json, sqlite3, re, datetime, hashlib, math, itertools, zlib and the rest. AN EDITOR MADE FOR A PHONE Syntax highlighting from the same tree-sitter grammars your desktop editor uses. Errors marked as you type, before you run anything. Auto-indent, bracket matching, a symbol row above the keyboard you can customise, snippets you can add to, a formatter, and syntax-tree views for when you want to see exactly how a line parsed. Scan code out of a photo with on-device text recognition. Keep as many scripts as you like, search them, and open .py and .js files from Files or iCloud Drive. FREE AND PREMIUM Running code is free with no daily limit: scripts, REPL entries and traces up to 200 steps. Formatting, code scanning, syntax trees, file export, watermark-free snapshots and the assistant use daily credits, and an optional ad adds more. Premium removes the credit count, traces whole programs, and unlocks the coding fonts, custom snippets and keys. Monthly, yearly, or a single lifetime purchase: your code runs on your device, so there is no server for us to keep paying for. Your code stays on your device unless you choose a cloud runtime yourself. PREMIUM OPTIONS - Premium Monthly: auto-renewing subscription, billed monthly - Premium Yearly: auto-renewing subscription, billed yearly - Premium Lifetime: one-time purchase, not a subscription Prices for your country are shown in the app before purchase. Payment is charged to your Apple ID at confirmation. Subscriptions renew automatically unless cancelled at least 24 hours before the period ends; manage or cancel them in your App Store account settings. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Codecell Terms of Use: https://compilers.lodyworks.com/codecell/terms Privacy Policy: https://compilers.lodyworks.com/codecell/privacy