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.

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 ...

(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.