Authorea is described as 'The online document editor for researchers that allows researchers to write, cite, host data, and publish research documents. Authorea is trusted worldwide by leading researchers writing and publishing content in every discipline, from astrophysics to zoology' and is a Word Processor in the office & productivity category. There are more than 50 alternatives to Authorea, not only websites but also apps for a variety of platforms, including Windows, Linux, Mac and SaaS apps. The best Authorea alternative is LibreOffice - Writer, which is both free and Open Source. Other great sites and apps similar to Authorea are Microsoft Word, Google Docs, Proton Docs and LyX.