The foundation
Terminal and Editor share a local BASIC runtime. Save projects on your device and explore classic graphics, sound, and modern media. Browser capabilities and compatibility continue to grow.
Explore CortexCortex BASIC Web · v1.0
Built for the curious.
BASIC editing and execution, local projects, graphics, sound, Git and Cortex AI.
FeaturesClassic foundations.
Classic foundations.
Modern possibilities.
BASIC editing and execution, local projects, graphics, sound, Git and Cortex AI.
The BASIC you remember.
QBASIC/QuickBASIC compatibility with documented browser limits.
Think out loud in the Terminal.
An immediate REPL for trying ideas, keeping variables between commands, and building up multiline expressions and blocks. Program editing belongs in the Editor, with syntax coloring, diagnostics, and the same runtime behind Play.
Give your ideas a home.
Projects autosave in this browser on this device. Clearing website data removes them. Private browsing may be temporary.
Make pixels dance.
Use classic SCREEN graphics, sprites, DRAW, BEEP, SOUND, and PLAY music. Load and transform images, play audio and video, and record audio where browser formats and permissions allow.
Connect to a bigger world.
REST / HTTP, JSON, CSV, SQLite, and WebSockets bring modern data into BASIC.
Build something you can touch.
Native-style UI controls, buttons, fields, lists, dialogs, and BASIC event handlers. On the web, the goal is accessible, responsive interfaces that fit your screen and work with a keyboard.
Put your device to work.
SCAN for QR and barcodes, GPS, camera, speech, sensors, touch, and controllers where the browser permits them.
A little help from Cortex AI.
Choose a task. The Cortex BASIC language reference is included with every request.
Keep moving. Keep your history.
Clone a GitHub repository or connect the current project. Review changes, commit locally, then push when ready.
Modern tools, familiar flow.
Unicode, collections, regular expressions, dates and time zones, timers, ZIP, hashing, secure random, documents, and sharing.
A workspace that goes with you.
PWA: Offline — local editing, BASIC and saved projects are available. AI, Git sync and online services need a connection. Keep exported backups. Clearing browser data removes projects; the browser may reclaim storage. Request persistent storage in Projects.
Your keys. Your device.
Prepare Git tokens and AI keys here. Credentials stay separate from BASIC programs and project backups.