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Archive of Our Own (AO3) is a nonprofit, open-source repository for fanfiction and other fanworks contributed by users. The site was created in 2008 by the Organization for Transformative Works. As of 2 April 2026, Archive of Our Own hosts over 17,200,000 works in over 77,400 fandoms, including those related to real people. The site has received generally positive reception for its curation, organization, and design, mostly done by readers and writers of fanfiction as well as those participating in fandom culture.