You’ve probably heard a whisper of a secret that anonymous messaging apps are hot right now. Behold the latest: Rumr, a group chat app that tells you who’s in the chatroom, but doesn’t show who’s saying what. Rumr uses a color scheme to provide what co-founder James Jerlecki calls “sliding scale anonymity.”_ Participants are each assigned a different color chat bubble, and the colors are shuffled around whenever someone joins or leaves the group. If your group is too small, it will be easy to figure out who’s who, but Jerlecki said in an interview that at around 4-5 participants,...

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