I used to lead the front-end development of this site, including all the visualizations. Glad to see it make HN front page. The team building this consists of really great people and it’s a great place to work. Most visualizations were custom built to various degrees.

Fun fact: the tree map was done with vanilla WebGL2 completely from scratch (handwritten custom shaders, no ThreeJS or Babylon) for performance and I think it’s probably the fastest snd smoothest animating tree map you can find on the Internet.