Archive of Our Own uses site skins instead of a conventional dark-mode switch. Its official dark, high-contrast skin is called Reversi.
To make the choice persistent, open Preferences, find Your site skin, open Public Site Skins, and select Use for Reversi. To switch back, choose Default in the footer or revert to the default skin in Preferences.
Without an account, AO3 may not save the skin preference. Browser extensions can provide a temporary alternative, but review their permissions before installing them.
Last verified: July 2026.