Programming languages used: JavaScript Click to see full answer. Similarly, you may ask, what is Gatsby used for?Gatsby can be used to build static sites that are Progressive Web Apps, follow the latest web standards, and are optimized to be highly performant. It makes use of the latest and popular technologies including ReactJS, Webpack, GraphQL, modern ES6+ JavaScript and CSS.Subsequently, question is, when should you not use Gatsby? When not to use Gatsby The reason is that it takes much time to build the site if you have lots of content. When creating a very large app with thousands of pages it can be really slow to rebuild. And if you have to wait 20 minutes when you hit publish before it goes live it’s not a very good solution. Furthermore, what is Gatsby framework? Gatsby is an open source, modern website framework that builds performance into every site by leveraging the latest web technologies such as React and GraphQL. Create blazing fast apps and websites without needing to become a performance expert.Who is using Gatsby? Websites using Gatsby # Hostname 1 gatsbyjs.org 2 reactjs.org 3 codesandbox.io 4 api-platform.com