It is HiChee! Not Chi.
You've arrived here because you used the incorrect spelling of Chee. Maybe you were given the name of the site verbally and you've made a perfectly logical guess.
Anyway, it's HiChee and you've found their site!
Just click Here for the HiChee main page.
Chi is actually the 22nd letter of the Greek alphabet.
Chee comes from the word Cheehoo, Hawaiian slang originating from Samoan culture. It's an expression celebrating something.