Codecell: Python JS TS Tracer

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About this app

Codecell is a code editor that shows you what your program actually did.

Write Python, JavaScript or TypeScript in one library. The language belongs to the script, not to the app, so a Python file and a TypeScript file sit side by side and each runs on the engine that suits it.

STEP THROUGH YOUR CODE
Run a program and scrub back through it line by line. At every step you see which line is executing, the call depth, and what each variable held at that moment. The editor highlights the line you are looking at. It is the difference between guessing why a loop is wrong and watching it go wrong.

A LIVE SESSION PER LANGUAGE
The REPL keeps its namespace between entries, so a value you define stays defined. Each language gets its own session, and tracing a program never disturbs it.

EVERYTHING RUNS ON YOUR PHONE
Real CPython 3.13 is embedded in the app. JavaScript and TypeScript run in the device's own engine, and TypeScript is compiled by the real tsc, bundled in the app, with the standard library alongside it. No account, no sign-in, no server, and it all works with the network switched off.

AN ASSISTANT THAT ACTUALLY RUNS THINGS
On supported devices, the built-in assistant answers questions about your code using the on-device model. It is not a chat box guessing at output: it can run your program and trace it with the same engines the editor uses, then show you what it found. Nothing you write is sent anywhere, and a suggested change is never applied until you tap Apply.

ALSO INSIDE
- Syntax highlighting, auto-indent and a key bar built for code
- Abstract and concrete syntax trees
- Capture code from a photo
- Share a snippet as an image
- Open a source file from anywhere on your device

The assistant requires a device with on-device AI support and is hidden, with a reason, everywhere else. Everything else works on any phone running Android 7 or later.
See every line your code runs. Python, JavaScript and TypeScript.
Updated on
Sep 8, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
  • This app may share these data types with third parties
    Device or other IDs
  • This app may collect these data types
    App activity, App info and performance, and Device or other IDs
  • Data is encrypted in transit
  • Data can’t be deleted

What’s new

First release. One library for Python, JavaScript and TypeScript - the language belongs to the script, not to the app. Step through a program line by line and watch the variables change, keep a live REPL per language, and ask the on-device assistant about your code. Everything runs on the phone, offline.
Content rating
Everyone
In-App Purchases
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App support

About the developer
로디웍스
contact@lodyworks.com
대한민국 부산광역시 부산진구 부산진구 신천대로62번길 2, 1207호(부전동, KH마이우스) 47289
+82 10-8591-9864

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