AO4

AO4 is an acronym used in multiple contexts, and it does not designate a single, officially recognized platform or project. In online fan-fiction communities, AO4 is most often mentioned as a speculative or informal shorthand for a fourth generation or successor to Archive of Our Own (AO3), the nonprofit fan-arts archive operated by the Organization for Transformative Works. As of the latest public information, no official AO4 site or policy exists, and references to AO4 reflect discussions, memes, or hypothetical planning rather than a concrete project.

Beyond fan fiction, AO4 can appear as an internal version number, model designation, or codename within various organizations or software projects. In these contexts, the meaning is specific to the organization and should be clarified by accompanying documentation.

Because AO4 is not standardized, descriptions of its features vary widely. In speculative discussions, proponents may propose enhancements such as improved moderation tools, more granular tagging, enhanced privacy and data portability, and community governance models. Critics warn that without coordination, an AO4 effort could create fragmentation or divert support from established archives like AO3.

Relation to AO3: AO3 remains the best-known platform in this space, emphasizing open access, fan rights, and volunteer-powered moderation. AO4 discussions typically reference AO3 to anchor expectations about scope and ethics.