Ask HN: A site that tracks what technologies a startup uses?

I spend a lot of time looking at startups and wondering what technologies they use. An online database of startups and the things they use to move bits around would be very, very useful in my opinion. Does anyone know if this sort of thing exists?

  • I think it would be so useful startups would do whatever they could to stay off it.

    Nobody needs their secret sauce exposed like that ;-)