I use an iPhone and my fiancé uses Android. He is not very tech savvy. He does not like to text for privacy reasons. I was going to recommend we get Signal but see others in Lemmy talking about Matrix. Is that better? If so, what app is best that works on both our phones? Thanks Lemmy friends!
In information technologies there are three main security goals: Confidentiality, Integrity, Availability. And while Signal is really good with the first two it utterly fails with the last one (at least on iOS).
Still I use Signal every day and would also recommend it to everybody who just wants a good private instant messaging client. While I also like and use Matrix (and see a bright future for the protocoll) there are still far too many problems to use it stress-free and smothly in everyday life.