The Quill LMS is built in Ruby on Rails. Quill Diagnostic and Quill Connect were written in React.js, whereas Quill Grammar and Quill Proofreader were written in Angular.js. We also use additional libraries and tools, including Redux, TypeScript, Redis, Firebase, and Elasticsearch, as needed.
Have more questions?
Please feel free to send a message to the Quill team using the green message bubble on the bottom right corner of the screen or email us at support@quill.org.