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12M 'registered' users...

I asked them about that (http://techcrunch.com/2016/01/19/trello-launches-developer-p...). Those are total signups, not active users. They are not disclosing monthly actives.

Yes it is. Some users will only ever use the mobile app. I don't know anyone on my teams except myself who log in on the web.

Quantcast has our mobile data too.