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The desktop app doesn't show a lock key icon in the message bubbles, while the Android app does. I never quite understood why the Android app clutters the interface with that icon since, I assume, _all_ messages are end-to-end encrypted anyway.

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The Android app also supports standard SMS with non-Signal users. Those messages are not encrypted, so they show the lock to indicate whether the message was sent via Signal or SMS.

Think Apple Messages blue versus green.

Ah, that makes sense, thanks! Never used the Android app for SMS :)

It isn't encrypted unless both parties have the app.

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