The [spacy.io](https://spacy.io) website is implemented in [Jade (aka Pug)](https://www.jade-lang.org), and is built or served by [Harp](https://harpjs.com).
This will serve the site on [http://localhost:9000](http://localhost:9000). You can then edit the jade source and refresh the page to see your changes.
writing. You can read more about our approach in our blog post, ["Rebuilding a Website with Modular Markup Components"](https://spacy.io/blog/modular-markup).