It's called This or That and functionality is currently very simple. You submit a question along with two images via SMS and you get your answer back usually within the hour.
I've had a few people use to test new logo ideas, to ask which of two TV shows to watch, or which outfit looks best. So far no one has paid for it, only a few hundred free users, but I think there's something here I just haven't marketed it to the right audience yet :)
My goal is to make this usable via Slack next year and let teams use it to trial new marketing campaigns or other run other small tests before launching. https://www.thisorthat.ai