What is E621?

e621 is a mature image board replacement for the image board Sidechan. A general audience image board, e926 (formerly e961) complements this site. E621 runs off of the Ouroboros platform, a danbooru -style software specifically designed for the site. It is likely that the site is named for the compound monosodium glutamate, whose E Number is E621.

What is the difference between E621 and e926?

What is E621’s mascot?

e621 has two mascots, both of them being feline characters; Hexerade and Esix . Early in 2010, the owners of e621 were looking for a mascot to adorn the site.

Is the site’s login system a part of E621?

The site’s login system shares e621’s login database, but requires separate login, as it most likely has its own cookies. Notably, it also has its own “safe for work” advertising.