</>For developers
Write the code. Ask the tutor right next to it.
A real editor, a terminal that runs your code, and an AI that sees the file you are working on. Built for the students who live in code.
Free plan. No credit card.
Everything you need to get unstuck
No tab switching. Your code, your output and your questions are in one place.
The tutor sees your code
Share the file, the lines you selected and your last run. A chip above the input shows exactly what the AI gets. Switch it off and nothing leaves your device.
Run it right here
JavaScript, TypeScript, Python, Lua, Ruby and SQL run in your browser. HTML shows a live preview. The output and the errors are the real ones.
Playgrounds that remember
Each playground keeps its files and its own chat. Start a new one for every assignment and pick up where you left off.
A snippet library
Save the bits you keep retyping. Search them, then drop them into any file.
Looks like your camp
It follows your theme, light or dark, Catppuccin included.
No fake output
If a language can't run here, the Run button says so. We never pretend a program ran.
Your language is probably here
Syntax highlighting for dozens of languages, and real execution for the ones that run in a browser.
Runs in your browser
- Python
- JavaScript
- TypeScript
- Ruby
- Lua
- SQL
- HTML
Edit with highlighting
- PHP
- CSS
- JSON
- Markdown
- YAML
- Bash
- C
- C++
- C#
- Java
- Kotlin
- Swift
- Go
- Rust
- Dart
- Scala
- Haskell
- R
- Julia
- Perl
- Elixir
- Clojure
- OCaml
- Zig
- Nim
- Objective-C
- Fortran
- Groovy
- F#
- Erlang
- Visual Basic
Logos belong to their owners. Ferris by Karen Rustad Tölva (CC0), the Go gopher by Renée French (CC BY 3.0), Tux by Larry Ewing, Simon Budig and Garrett LeSage.
How it works
- 1
Open a playground
Pick Code Playground in your Backpack and start a new one, or open an old one.
- 2
Write and run
Type code, hit Run, read the real output. Add files for each part of the project.
- 3
Ask the tutor
Ask what a line does or why it fails. The tutor answers with your line numbers.
Questions
Does the AI see my code?
Only when Share code with AI is on. It sends the open file, the lines you selected and your last run. The chip above the input says what is shared, and with the switch off nothing is sent.
What can I run?
JavaScript, TypeScript, Python, Lua, Ruby and SQL run in your browser, and HTML shows a live preview. Python uses the standard library, without extra packages. Other languages are edit only for now.
Is my code saved?
Yes. Playgrounds, files, chats and snippets are saved to your account. Your code is only sent to the AI when you share it.
Does it use AI credits?
Each message to the tutor uses the same credits as a normal chat message. Running code is free.
My program never stops.
Runs stop after 10 seconds and the terminal says so. Fix the loop and run it again.