In Delta Chat on iOS, it used to be that there was a red number for unmuted new messages and a grey number for muted new messages. Now there’s also a blue number (which I’ve seen on unmuted threads so far). What does the blue number mean?
the new blue is the old red 
we just synchronized the “unread counter” between all systems to have a better multi-device experience - before we were using red (ios), green (android), blue (desktop) - now we are using blue everywhere, see https://github.com/deltachat/deltachat-android/pull/2148 and synchronize unread-badge-color with desktop and android by r10s · Pull Request #1407 · deltachat/deltachat-ios · GitHub for more details.
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