Rating

Ratings for a few popular boorus and links to the page that outlines their definitions. These ratings are primarily for the level of sexual content with some of the boorus having additional ratings for other types of content of the precise type of sexual content.

Danbooru: Safe, questionable, explicit. https://danbooru.donmai.us/wiki_pages/howto%3Arate

Gelbooru: Safe, questionable, explicit. https://gelbooru.com/index.php?page=wiki&s=view&id=2535

Sankaku: Safe, questionable, explicit. https://chan.sankakucomplex.com/wiki/show?title=help%3A_ratings

E621: Safe, questionable, explicit. https://e621.net/help/ratings

Derpibooru: Safe, suggestive, questionable, explicit. https://derpibooru.org/pages/tags

Furbooru: Safe, suggestive, questionable, explicit. https://furbooru.org/pages/tags