I just downloaded and tried out an app called "Time to code - learn HTML, CSS and JavaScript." I have never used it to teach (and only downloaded it in response

I just downloaded and tried out an app called "Time to code - learn HTML, CSS and JavaScript." I have never used it to teach (and only downloaded it in response to this Ask HN). But, what I have seen is actually quite good! It might get a bit boring for teenagers, but as a learning tool, it seems pretty decent. (Also note that I'm 38 so I'm not a very good judge of what teenagers would enjoy.)