Matrix is a secure communication protocol, offering end-to-end encryption, VoIP, Video, chat rooms, document sharing etc. We will use the Riot client during our tests. Because it's complicated for people to understand what's the difference between Riot and Matrix, we call our project "Riot review", but Riot is the front end app that connects to the Matrix decentralized network. We will thoroughly review this app, from a security and usability perspective and publish an article. The app will be used by several testers for at least four weeks. You can get the final article published in another language than English by making a contribution to the Ad-Hoc ongoing Beneficial Project.