Briar supports communication over multiple mediums, including wifi & Bluetooth, has forward secrecy, and feels quite 'signal-like' so its not impossible to get people to use it.
https://briarproject.org/
Briar looks really nice for people that really need the extra security and privacy, though.
I've been interested in SimpleX lately, but I don't really have anyone to properly test it with.
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Briar supports communication over multiple mediums, including wifi & Bluetooth, has forward secrecy, and feels quite 'signal-like' so its not impossible to get people to use it.
https://briarproject.org/