Ember is used on many popular websites, including Discourse, Groupon, Vine, Live Nation, Nordstrom, and Chipotle. Although primarily considered a framework for the web, it is also possible to build desktop and mobile applications in Ember. The most notable example of an Ember desktop application is Apple Music, a feature of the iTunes desktop application.
Like Ruby on Rails, Ember follows Convention over Configuration (CoC), and the Don't Repeat Yourself (DRY) principle. It is a highly opinionated framework that provides good defaults and cultivates shared abstractions so developers are free to focus on bigger and better ideas.