Swimlanes.io is a free webapp for making sequence diagrams. You simply edit the text on the left and the diagram is updated in real time. You can download your sequence diagrams as images or distribute with a link.
title: Before Client -> Server: `anonymous user` Login (user+password) Server -> Client : user session `logged in user` note: **at this point in time** the user is authenticated and a valid User _session_ is already available. Entities, Microflow, Pages are available by default. Client -> Server: `logged in user` MFA code Server -> Client : Navigate to page `logged in user`