As a substitute, I believe Tynker would be a great learning system for students that teaches them how to code. They can design games, build apps, and make projects. It makes it easy for teachers to teach computer programming.
I agree that Tynker may be a special help and even as a librarian I may pick up some basics which will help to reinforce some basics such as sequencing.
I think this could be a great resource to use. I am always trying to find new tools for my students to use. This Tynker would be fun for me and the students!
Thanks