Can anyone recommend a similar, “professional grade” coding site that does allow under-13 accounts (with school and/or parent consent, of course)? I don’t think it’s right to have parents own the accounts and let their children use them, but I guess that might be technically legal.
What’s nice about Rep.it is that it covers multiple languages, and supports teachers with a “classroom” feature that pushes out assignments to students. The downside of Repl.it (and most of the other similar products I have found) is that they use social media to allow users to share their code. Twitter and Facebook are of course off-limits to under-13-year olds.