What is the preprint server ArXiv?The ar\(\chi\)iv (pronounced "archive", since \(\chi\) = "chi") is the most popular preprint repository in the world. (Read: What is a preprint?) It was started in 1991 by physicist Paul Ginsparg to become a way to quickly and freely give the scientific community access to the submission-ready research papers, as e-prints. While the arXiv initially covered only the fields of physics and astronomy, it grew over time to encompass other fields, such as computer science, quantitative biology, statistics, and quantitative finance. The rise of arXiv has been mostly limited to fields that use LaTeX, a typesetting system for math-heavy documents. This is because (1) the most efficient way to submit papers to arXiv is by uploading a LaTeX file which gets compiled to PDF, and (2) pre-printing has historically been a practice popular in the hard sciences --- at CERN, it was performed via inter-library exchange of printed copies before the web even existed \cite{pepe2005cern}. However, in recent years, pre-prints are catching on as a legal and free mechanism to openly and quickly share research also in the life sciences (see ASAPbio, and BiorXiv, for example).How do ArXiv and Authorea compare?At first glance, ArXiv and Authorea may not seem related to one another. ArXiv is a content repository, while Authorea is a content creation system. However, Authorea - with the launch of a number of publishing features - is quickly becoming an open repository, as well. Below, we highlight some points of comparison between Authorea and ArXiv.1. More than just a collection of PDFs: web native papers.There is growing consensus in scholarly communication circles that academic publishing needs to move "beyond the PDF" (see Force 11 conference). The PDF is a great portable format for printing, but it is not the best format to share, discuss, and read on the web. Every article on arXiv, being a PDF, is non-actionable. In this respect, the arXiv is a "PDF dump".2. For LaTeX users. And for everyone else too!The ArXiv relies heavily on LaTeX. For Authorea, LaTeX is one of many formats you can write in. Others include Markdown, and HTML (rich text, like Word!). Authorea offers a format-neutral, web-native platform. Regardless of the format, you render content on the web - not on a separate pane that compiles a PDF (side note, you can still export a PDF). The advantage: Authorea documents are not constrained to the hard sciences and to the LaTeX community. Authorea is for all scholars: from astrophysics to zoology. Authorea's rich text editor is a true WYSIWYG editor (What you see is what you get). It also has the ability to include as much LaTeX and mathematical notation as you need. Every document written in Authorea becomes a beautiful webpage.