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Vapor is strictly using the Steem blockchain, while Abono will be using the Bitshares blockchain, have loyalty rewards, payment processing for fiat and an improved codebase and UI from Vapor!

Ah ok. Would it be much more difficult to make Abono support STEEM as well?

well, as Steem is part of the Bitshares gateways and exchange, then i would believe that it hopefully isnt that hard