Apologies for the re-post. I realized since I'm the author this would make more sense as a Show HN than as a anonymous link (and it was too late to edit).
seems broken? i see CORS problems with loading model.json in both Chrome and Safari.
Hm, it definitely works for me (on a re-try) and most people according to analytics don't get an error message (as well as friends who've tried it). I do load the models from a different domain (via cloudfront, though I've set up CORS there). Maybe you have some extra strict setting activated? (Ps big fan paul! fanboying from the interaction)