The Quill LMS is built in Ruby on Rails. Our newer tools, including Quill Diagnostic and Quill Connect, were written in React.js, while Quill Grammar and Quill Proofreader were written in Angular.js. We make use of additional libraries and tools as needed, including Redux, TypeScript, Redis, Firebase, and Elasticsearch.
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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 email@example.com.