Enter a Red or REBOL expression:

Want to try out the new Red programming language without downloading it? Installing Red is quick and easy due to its small size, but trying it here is even easier. Just type your Red expressions in the above form and press the Do button.

Please note that some functions will not work in this web environment, such as interactive programs. Most notably, the cross-platform graphics system is not accessible. You can run GUI examples on your own computer. To do so, you'll have to install one of the extended Red distributions that includes the GTK+ binding, or REBOL/View, depending on the programs you want to run.

This is not a browser plug-in: your Red scripts run on our server. Limits apply; for example, you may receive an evaluation error message if processing takes too long, or a blank result if you're using too much memory or other resources.