Ember

How this works: the room name you pick doubles as the encryption key for everything said inside it. Nothing readable ever reaches the database, only scrambled data. That also means the name itself is the whole secret: use a long, unusual phrase only the two of you would think of, never something short or guessable like "test" or "hello". Anyone who later learns the exact name could open the room, same as anyone who learns a shared password could. So when in doubt, tap Generate a private room name instead of typing your own.