The original intent of the Readium Chrome extension was to be used primarily by authors, publishers, and developers creating and testing EPUB 3 content and tools. However the Readium Chrome Extension now has almost 600,000 active users (as of February 2016) and has been translated into 11 languages with the help of our contributors, so clearly we have exceeded that expectation. That said, there is more to be done to make it a full-fledged EPUB reader. While RCE supports almost all of the EPUB 3.0.1 standard, there are still some missing features (e.g. a sortable library, annotations, search, etc.), but the Readium Foundation intends to continue expanding and supporting it in the future..
