There are several mobile apps already released or in development for Steem!
Steemit Inc's plans have been evolving as we get our vision correct for approaching sign ups, identities, marketplace, bounty system, promoted content and the rest of the social blockchain stack. We'll be releasing a more in depth roadmap in the near future.
would you trust a random, non audited non steemit checked app with your keys?
I wouldn't even give them my posting key
Exactly! I will not give my key to anyone else if not Steemit Inc