Secure messaging is about much more than end-to-end encryption. Metadata collection, open-source transparency, independent audits, default encryption, account requirements, backups, and jurisdiction all influence how private a messaging platform actually is. This comparison examines the major privacy-focused messaging apps and discusses the trade-offs each one makes instead of trying to crown a single “best” option.
SimpeX chat , lxmf ,xmpp , ratspeak ,sideband ,meshchat ,nomad network .
Never heard of Linddun ,will give it a try.
Linddun is basically 7 parameters for privacy. Yes a bit less known true
I dont think it is an app itself, but a scoring system to grade the privacy of existing other apps more empirically vs. their marketing BS.