Hey this is really cool, I literally had the same idea about a month ago but ultimately decided to not pursue it. Glad someone else did.

A few quick Qs -

1) Do you use the available auto-generated transcripts from youtube? Or do you do any audio parsing? I know transcripts aren't always available.

2) Do you have any plans to monetize in some way, do you think it would be possible? It's definitely a neat product but a tad generic and replicable, so I'm curious.