Sqarr

Hello everyone, I am looking for the most anonymous messaging app between friends. Such an application where even the police or hackers will never find what I wrote. For example, like Threema, but I'm looking for something that's free.Briar, Matrix, Cwtch, Signal, Session, there are many, but which one is the best? I want to protect my privacy and I want my private messages to never be seen or...