We check this website, now kanban-chi.appspot.com is up and dont blocked for our system and other users of the Internet.
So, answer to question: Is kanban-chi Down Right Now? - NO! kanban-chi is up!
If you have problem with access to site kanban-chi, and domain kanban-chi.appspot.com is not avalible.
Clear browser cache and/or try other web browser
(Chrome, Firefox or Safari).