\ˈgä-chə\ Gif to Tell Computers and Humans Apart.
To start the application listening on port 8080:
$ goapp serve
The GTCHA is live at http://localhost:8080/static/gtcha.html and a demo version (acting as an embed) can be viewed at http://localhost:8080/static/test.html.
CSS is processed using Myth:
$ myth -w static/gtcha.css static/out.css