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Yes you can use it to post on Steem, we have Android and iOS version which is called eSteem Mobile and we have desktop version for Linux, Windows and Mac users which is called eSteem Surfer.

Nice I'll have to check it out tomorrow, does it offer more html functionality than steemit?

good to know! Def will be using this

do they take a % on the rewards?

Steem, yes. Steemit is an interface. A dying one, at that.