JS Compiler

JS Compiler turns your phone into a JavaScript workbench.

Your code runs on the device, in the same V8 engine that powers Chrome. There is no account to create, no server to wait for, and no network required - press play and the output is there.

WRITE COMFORTABLY
- Syntax highlighting tuned for JavaScript
- Line numbers that stay correct on wrapped lines
- Auto-indent, auto-closing brackets and quotes
- A keyboard accessory row for the symbols a phone keyboard hides
- Undo and redo that group your keystrokes sensibly
- Choose your font, size, and line spacing

SEE MISTAKES BEFORE YOU RUN
Errors are marked as you type. The line is highlighted and the message is shown right there, so you fix a typo without hunting for it.

REAL TOOLS, NOT A TOY
- Format your code with one tap
- Real ESTree syntax trees (AST and CST) from a real parser
- An outline of your functions and classes
- Scan printed code with the camera and turn it into text
- Import and export .js files, or open one shared from another app
- Turn a snippet into a shareable, syntax-highlighted image
- Save your own snippets and insert them anywhere

FREE, WITH PREMIUM IF YOU WANT IT
Everything above is usable for free, with a daily run allowance that resets each day. Premium removes the limit and unlocks formatting, OCR, syntax trees, import and export, extra fonts, custom snippets, and watermark-free image export. Available monthly, yearly, or as a one-time lifetime purchase.

PRIVACY
Your code stays on your device. We do not upload it, and we do not ask who you are.