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I recently was selecting a messaging platform for my family, and we evaluated both Signal and Slack, and went with Slack. My wife did the same with her family, and went with Signal. From this, I gather they overlap in some features enough to compete for some use cases.

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One (Signal) is a replacement for texts, and one isn't. "Overlap in features" wouldn't cover it, but rather how much you want it to be like texting.

Thomas Ptacek is a big Signal advocate, as am I, but he doesn't like to think of it as a drop-in replacement for texting, whereas I do (because that's what it is and where it shines). I move texting onto Signal whenever I can.

Why not Keybase over Slack?

Not saying Keybase is better; no dog in that fight, just curious if you had considered it.

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