Piq is available from within any modern web-browser. It's free and doesn't require any registration.
Pro Allows for customized t-shirt art
No other online software is linked to a professional t-shirt design website and which allows you to wear your own creations.
Pro Collaboration features
Pro Active, social community
Pro Top 20 leaderboards
Con Flash plugin is required
Piq is written in Adobe Flash, meaning that the Flash plugin is required in the browser.