Karel is the obedient dog featured in the introductory, interactive programming exercises from CodeHS. It can perform basic functions--move in straight lines, turn, and fetch the ball. But Karel's ...

So, CodeHS wants to connect students with a real person to help them learn, offering debugging help and feedback on programming style, etc. as part of each exercise.

(Full disclosure: I know Zach's mom). The goal is to teach programming to 1,000 students--at least 300 of whom will be low-income--in the next six months.