Been aware of Sincerely for a while (though haven't been dealing in photos so no cause to use it). Headline made me think this was going to be a Sherlocking, pleasantly surprised to see that's far from the case. Nice catch!
Looks pretty awesome! Can you give me some use cases?
Ship API literally just launched, so the sky's the limit. Mailing a postcard is as simple as hitting two methods (upload and create). After running Sincerely for a little over a year, we've definitely witnessed how meaningful getting something in the mail can be.