The previous "King of the Hill" in encrypted messaging apps was Signal. Yes, Signal's messages were encrypted, but you could see who they were going to. A prominent financial whistleblower was recently caught by using Signal (Natalie Edwards), because investigators only had to look at who her messages were going to (even if the content itself was encrypted). Yes, Natalie was sending messages to the journalist who broke her story concerning leaked docs (from U.S. government agency FinCen). Session app doesn't leave a trace of the contents, OR who the message is going to. A valuable tip for you and your friends. Here's a summary: Session is: - decentralised - onion-routed - anonymous account creation - e2ee by default - funded by a registered non-profit org - fully open source (clients and server) - independently audited (clients and server).